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Sweep of the simple cases.
Cc: netdev@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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The local and remote features are organized by page number. Page 0
are the LMP features, page 1 the host features, and any pages beyond 1
features that future core specification versions may define. So far
we've only had the first two pages and two separate variables has been
convenient enough, however with the introduction of Core Specification
Addendum 4 there are features defined on page 2.
Instead of requiring the addition of a new variable each time a new page
number is defined, this patch refactors the code to use a single table
for the features. The patch needs to update both the hci_dev and
hci_conn structures since there are macros that depend on the features
being represented in the same way in both of them.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
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We currently do not allow using hci_conn from outside of HCI-core.
However, several other users could make great use of it. This includes
HIDP, rfcomm and all other sub-protocols that rely on an active
connection.
Hence, we now introduce hci_conn ref-counting. We currently never call
get_device(). put_device() is exclusively used in hci_conn_del_sysfs().
Hence, we currently never have a greater device-refcnt than 1.
Therefore, it is safe to move the put_device() call from
hci_conn_del_sysfs() to hci_conn_del() (it's the only caller). In fact,
this even fixes a "use-after-free" bug as we access hci_conn after calling
hci_conn_del_sysfs() in hci_conn_del().
From now on we can add references to hci_conn objects in other layers
(like l2cap_sock, HIDP, rfcomm, ...) and grab a reference via
hci_conn_get(). This does _not_ guarantee, that the connection is still
alive. But, this isn't what we want. We can simply lock the hci_conn
device and use "device_is_registered(hci_conn->dev)" to test that.
However, this is hardly necessary as outside users should never rely on
the HCI connection to be alive, anyway. Instead, they should solely rely
on the device-object to be available.
But if sub-devices want the hci_conn object as sysfs parent, they need to
be notified when the connection drops. This will be introduced in later
patches with l2cap_users.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
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Used PTR_RET function instead of IS_ERR and PTR_ERR.
Patch found using coccinelle.
Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@gmail.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
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The uuid should be printed in the CPU endianness and not in little-endian.
Acked-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
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Instead of old unsafe batostr function use %pMR print specifier
for printing Bluetooth addresses in sprintf and seq_printf
statements.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
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Most of the include were unnecessary or already included by some other
header.
Replace module.h by export.h where possible.
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This is some leftover from the last patches that fixed style. It is mostly
line over 80 characters fixes reported by checkpatch.pl.
checkpatch.pl is clean for these files now.
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Follow the net subsystem rules.
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Fix sparse warnigns below:
...
net/bluetooth/hci_sysfs.c:458:33: warning: cast to restricted __be32
net/bluetooth/hci_sysfs.c:458:47: warning: cast to restricted __be16
...
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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We initialize the "struct device" in hci_alloc_dev() for a long time now
so we can access hdev->dev.parent directly. Hence, we can drop the
temporary field hdev->parent which is used in no other place than
hci_add_sysfs().
SET_HCIDEV_DEV() is never called after registering a device by the
drivers so we do not overwrite internal device-state. Furthermore,
hdev->dev is initialized to 0 by kzalloc() inside hci_alloc_dev() so the
default behavior with dev.parent = NULL is kept.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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This enhances code readability a lot and avoids using void* even though
we know the type of the variable.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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This avoids using the dev_set/get_drvdata() functions to retrieve a
pointer to our own structure. We can use simple pointer arithmetic here.
The drvdata field is actually not needed by any other code-path but this
makes the code more consistent with hci_dev.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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We currently use dev_set_drvdata to keep a pointer to ourself. This
doesn't make sense as we are the bus and not a driver. Therefore,
introduce to_hci_dev() so we can get a struct hci_dev pointer from a
struct device pointer.
dev_set/get_drvdata() is reserved for drivers that provide a device and
not for the bus using the device. The bus can use simple pointer
arithmetic to retrieve its private data.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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We provide a device-object to other subsystems and we provide our own
release-function. Therefore, the device-object must own a reference to
our module, otherwise the release-function may get deleted before the
device-object does.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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This struct is used for not just inquiry caching but also for general
device discovery state tracking so it's better to rename it to something
more appropriate.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
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This patch adds initial support for mgmt_confirm_name. It adds the
necessary tracking of the name state by extending the inquiry cache. The
actual name resolving operation (to be done once inquiry is finished) is
not yet part of this patch.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
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This makes it possible to use the convenience functions provided for
standard kernel list types and it also makes it easier to extend the use
of the cache for the management interface where e.g. name resolving
control will be needed.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/padovan/bluetooth-next
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As we run in process context now we don't need worqueue to add e del from
sysfs.
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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Now we run everything in HCI in process context, so it's a better idea use
mutex instead spin_lock. The macro remains hci_dev_lock() (and I got rid
of hci_dev_lock_bh()), of course.
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux
Conflicts:
drivers/net/wireless/iwlegacy/iwl-debugfs.c
drivers/net/wireless/iwlegacy/iwl-rx.c
drivers/net/wireless/iwlegacy/iwl-scan.c
drivers/net/wireless/iwlegacy/iwl-tx.c
include/net/bluetooth/bluetooth.h
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When all items in the list have the same type there is no much of a point
to use list_for_each except if you want to use the list pointer itself.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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With calls to modular infrastructure, these files really
needs the full module.h header. Call it out so some of the
cleanups of implicit and unrequired includes elsewhere can be
cleaned up.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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As we introduced hci_init_sysfs() we should also rename
hci_register_sysfs() and hci_unregister_sysfs() to hci_add_sysfs() and
hci_del_sysfs() like we do with hci_conn_add/del_sysfs(). It looks more
consistent now.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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We must not call device_del() if we didn't use device_add(). See module.c
for comments on that. Therefore, we need to call device_initialize() when
allocating the hci device and later device_add() instead of
device_register().
This also fixes a bug when hci_register_dev() failed and we call
hci_free_dev() without a valid core device. hci_free_dev() segfaults while
calling put_device() on invalid memory.
We already do this with hci_conn connections (hci_conn_init_sysfs()) so
they do not need to be fixed.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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Add LE link type as known connection type for debugfs stringizing
output.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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Some test systems require an arbitrary delay to the auto-accept test
cases for Secure Simple Pairing in order for the tests to pass.
Previously when this was handled in user space it was worked around by
code modifications and recompilation, but now that it's on the kernel
side it's more convenient if there's a debugfs interface for it.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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Convert from strict_strto*() interfaces to kstrto*() interfaces.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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This patch adds a clear define for the maximum device name length in HCI
messages and thereby avoids magic numbers in the code.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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This patch adds a debugfs entry to list the UUIDs that have been
registered through the management interface.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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The Bluetooth core uses the the BD_ADDR in the opposite order from the
human readable order. So we are changing batostr() to print in the
correct order and then removing some baswap(), as they are not needed
anymore.
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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HCI transport drivers may not know what type of radio an AMP device has
so only say whether they're BR/EDR or AMP devices.
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
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The bdaddr in the list root is completely unused and just
taking up space.
Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch adds a debugfs blacklist entry for each HCI device which can
be used to list the current content of the blacklist.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Use strict_strtoul as suggested by checkpatch.pl for more strict input
checking.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Instead of having a global workqueue for all controllers, it makes
more sense to have a workqueue per controller.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
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Some of the debug files ended up wrongly in sysfs, because at that point
of time, debugfs didn't exist. Convert these files to use debugfs and
also seq_file. This patch converts all of these files at once and then
removes the exported symbol for the Bluetooth sysfs class.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The inquiry cache information in debugfs should be using seq_file support
and not allocating memory on the stack for the string. Since the usage of
these information is really seldom, using single_open() for it is good
enough.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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With the Bluetooth 3.0 specification and the introduction of alternate
MAC/PHY (AMP) support, it is required to differentiate between primary
BR/EDR controllers and 802.11 AMP controllers. So introduce a special
type inside HCI device for differentiation.
For now all AMP controllers will be treated as raw devices until an
AMP manager has been implemented.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The output of the inquiry cache is only useful for debugging purposes
and so move it into debugfs.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The hdev->type is misnamed and should be actually hdev->bus instead. So
convert it now.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Due to driver core changes dev_set_drvdata will call kzalloc which should be
in might_sleep context, but hci_conn_add will be called in atomic context
Like dev_set_name move dev_set_drvdata to work queue function.
oops as following:
Oct 2 17:41:59 darkstar kernel: [ 438.001341] BUG: sleeping function called from invalid context at mm/slqb.c:1546
Oct 2 17:41:59 darkstar kernel: [ 438.001345] in_atomic(): 1, irqs_disabled(): 0, pid: 2133, name: sdptool
Oct 2 17:41:59 darkstar kernel: [ 438.001348] 2 locks held by sdptool/2133:
Oct 2 17:41:59 darkstar kernel: [ 438.001350] #0: (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.+.}, at: [<faa1d2f5>] lock_sock+0xa/0xc [l2cap]
Oct 2 17:41:59 darkstar kernel: [ 438.001360] #1: (&hdev->lock){+.-.+.}, at: [<faa20e16>] l2cap_sock_connect+0x103/0x26b [l2cap]
Oct 2 17:41:59 darkstar kernel: [ 438.001371] Pid: 2133, comm: sdptool Not tainted 2.6.31-mm1 #2
Oct 2 17:41:59 darkstar kernel: [ 438.001373] Call Trace:
Oct 2 17:41:59 darkstar kernel: [ 438.001381] [<c022433f>] __might_sleep+0xde/0xe5
Oct 2 17:41:59 darkstar kernel: [ 438.001386] [<c0298843>] __kmalloc+0x4a/0x15a
Oct 2 17:41:59 darkstar kernel: [ 438.001392] [<c03f0065>] ? kzalloc+0xb/0xd
Oct 2 17:41:59 darkstar kernel: [ 438.001396] [<c03f0065>] kzalloc+0xb/0xd
Oct 2 17:41:59 darkstar kernel: [ 438.001400] [<c03f04ff>] device_private_init+0x15/0x3d
Oct 2 17:41:59 darkstar kernel: [ 438.001405] [<c03f24c5>] dev_set_drvdata+0x18/0x26
Oct 2 17:41:59 darkstar kernel: [ 438.001414] [<fa51fff7>] hci_conn_init_sysfs+0x40/0xd9 [bluetooth]
Oct 2 17:41:59 darkstar kernel: [ 438.001422] [<fa51cdc0>] ? hci_conn_add+0x128/0x186 [bluetooth]
Oct 2 17:41:59 darkstar kernel: [ 438.001429] [<fa51ce0f>] hci_conn_add+0x177/0x186 [bluetooth]
Oct 2 17:41:59 darkstar kernel: [ 438.001437] [<fa51cf8a>] hci_connect+0x3c/0xfb [bluetooth]
Oct 2 17:41:59 darkstar kernel: [ 438.001442] [<faa20e87>] l2cap_sock_connect+0x174/0x26b [l2cap]
Oct 2 17:41:59 darkstar kernel: [ 438.001448] [<c04c8df5>] sys_connect+0x60/0x7a
Oct 2 17:41:59 darkstar kernel: [ 438.001453] [<c024b703>] ? lock_release_non_nested+0x84/0x1de
Oct 2 17:41:59 darkstar kernel: [ 438.001458] [<c028804b>] ? might_fault+0x47/0x81
Oct 2 17:41:59 darkstar kernel: [ 438.001462] [<c028804b>] ? might_fault+0x47/0x81
Oct 2 17:41:59 darkstar kernel: [ 438.001468] [<c033361f>] ? __copy_from_user_ll+0x11/0xce
Oct 2 17:41:59 darkstar kernel: [ 438.001472] [<c04c9419>] sys_socketcall+0x82/0x17b
Oct 2 17:41:59 darkstar kernel: [ 438.001477] [<c020329d>] syscall_call+0x7/0xb
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Let attribute group vectors be declared "const". We'd
like to let most attribute metadata live in read-only
sections... this is a start.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The calls to flush_work() are pointless in a single thread workqueue
and they are actually causing a lockdep warning.
=============================================
[ INFO: possible recursive locking detected ]
2.6.30-rc6-02911-gbb803cf #16
---------------------------------------------
bluetooth/2518 is trying to acquire lock:
(bluetooth){+.+.+.}, at: [<c0130c14>] flush_work+0x28/0xb0
but task is already holding lock:
(bluetooth){+.+.+.}, at: [<c0130424>] worker_thread+0x149/0x25e
other info that might help us debug this:
2 locks held by bluetooth/2518:
#0: (bluetooth){+.+.+.}, at: [<c0130424>] worker_thread+0x149/0x25e
#1: (&conn->work_del){+.+...}, at: [<c0130424>] worker_thread+0x149/0x25e
stack backtrace:
Pid: 2518, comm: bluetooth Not tainted 2.6.30-rc6-02911-gbb803cf #16
Call Trace:
[<c03d64d9>] ? printk+0xf/0x11
[<c0140d96>] __lock_acquire+0x7ce/0xb1b
[<c0141173>] lock_acquire+0x90/0xad
[<c0130c14>] ? flush_work+0x28/0xb0
[<c0130c2e>] flush_work+0x42/0xb0
[<c0130c14>] ? flush_work+0x28/0xb0
[<f8b84966>] del_conn+0x1c/0x84 [bluetooth]
[<c0130469>] worker_thread+0x18e/0x25e
[<c0130424>] ? worker_thread+0x149/0x25e
[<f8b8494a>] ? del_conn+0x0/0x84 [bluetooth]
[<c0133843>] ? autoremove_wake_function+0x0/0x33
[<c01302db>] ? worker_thread+0x0/0x25e
[<c013355a>] kthread+0x45/0x6b
[<c0133515>] ? kthread+0x0/0x6b
[<c01034a7>] kernel_thread_helper+0x7/0x10
Based on a report by Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Tested-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The module refcount is increased by hci_dev_hold() call in hci_conn_add()
and decreased by hci_dev_put() call in del_conn(). In case the connection
setup fails, hci_dev_put() is never called.
Procedure to reproduce the issue:
# hciconfig hci0 up
# lsmod | grep btusb -> "used by" refcount = 1
# hcitool cc <non-exisiting bdaddr> -> will get timeout
# lsmod | grep btusb -> "used by" refcount = 2
# hciconfig hci0 down
# lsmod | grep btusb -> "used by" refcount = 1
# rmmod btusb -> ERROR: Module btusb is in use
The hci_dev_put() call got moved into del_conn() with the 2.6.25 kernel
to fix an issue with hci_dev going away before hci_conn. However that
change was wrong and introduced this problem.
When calling hci_conn_del() it has to call hci_dev_put() after freeing
the connection details. This handling should be fully symmetric. The
execution of del_conn() is done in a work queue and needs it own calls
to hci_dev_hold() and hci_dev_put() to ensure that the hci_dev stays
until the connection cleanup has been finished.
Based on a report by Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Tested-by: Bing Zhao <bzhao@marvell.com>
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Setting the name of a sysfs device has to be done in a context that can
actually sleep. It allocates its memory with GFP_KERNEL. Previously it
was a static (size limited) string and that got changed to accommodate
longer device names. So move the dev_set_name() just before calling
device_add() which is executed in a work queue.
This fixes the following error:
[ 110.012125] BUG: sleeping function called from invalid context at mm/slub.c:1595
[ 110.012135] in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper
[ 110.012141] 2 locks held by swapper/0:
[ 110.012145] #0: (hci_task_lock){++.-.+}, at: [<ffffffffa01f822f>] hci_rx_task+0x2f/0x2d0 [bluetooth]
[ 110.012173] #1: (&hdev->lock){+.-.+.}, at: [<ffffffffa01fb9e2>] hci_event_packet+0x72/0x25c0 [bluetooth]
[ 110.012198] Pid: 0, comm: swapper Tainted: G W 2.6.30-rc4-g953cdaa #1
[ 110.012203] Call Trace:
[ 110.012207] <IRQ> [<ffffffff8023eabd>] __might_sleep+0x14d/0x170
[ 110.012228] [<ffffffff802cfbe1>] __kmalloc+0x111/0x170
[ 110.012239] [<ffffffff803c2094>] kvasprintf+0x64/0xb0
[ 110.012248] [<ffffffff803b7a5b>] kobject_set_name_vargs+0x3b/0xa0
[ 110.012257] [<ffffffff80465326>] dev_set_name+0x76/0xa0
[ 110.012273] [<ffffffffa01fb9e2>] ? hci_event_packet+0x72/0x25c0 [bluetooth]
[ 110.012289] [<ffffffffa01ffc1d>] hci_conn_add_sysfs+0x3d/0x70 [bluetooth]
[ 110.012303] [<ffffffffa01fba2c>] hci_event_packet+0xbc/0x25c0 [bluetooth]
[ 110.012312] [<ffffffff80516eb0>] ? sock_def_readable+0x80/0xa0
[ 110.012328] [<ffffffffa01fee0c>] ? hci_send_to_sock+0xfc/0x1c0 [bluetooth]
[ 110.012343] [<ffffffff80516eb0>] ? sock_def_readable+0x80/0xa0
[ 110.012347] [<ffffffff805e88c5>] ? _read_unlock+0x75/0x80
[ 110.012354] [<ffffffffa01fee0c>] ? hci_send_to_sock+0xfc/0x1c0 [bluetooth]
[ 110.012360] [<ffffffffa01f8403>] hci_rx_task+0x203/0x2d0 [bluetooth]
[ 110.012365] [<ffffffff80250ab5>] tasklet_action+0xb5/0x160
[ 110.012369] [<ffffffff8025116c>] __do_softirq+0x9c/0x150
[ 110.012372] [<ffffffff805e850f>] ? _spin_unlock+0x3f/0x80
[ 110.012376] [<ffffffff8020cbbc>] call_softirq+0x1c/0x30
[ 110.012380] [<ffffffff8020f01d>] do_softirq+0x8d/0xe0
[ 110.012383] [<ffffffff80250df5>] irq_exit+0xc5/0xe0
[ 110.012386] [<ffffffff8020e71d>] do_IRQ+0x9d/0x120
[ 110.012389] [<ffffffff8020c3d3>] ret_from_intr+0x0/0xf
[ 110.012391] <EOI> [<ffffffff80431832>] ? acpi_idle_enter_bm+0x264/0x2a6
[ 110.012399] [<ffffffff80431828>] ? acpi_idle_enter_bm+0x25a/0x2a6
[ 110.012403] [<ffffffff804f50d5>] ? cpuidle_idle_call+0xc5/0x130
[ 110.012407] [<ffffffff8020a4b4>] ? cpu_idle+0xc4/0x130
[ 110.012411] [<ffffffff805d2268>] ? rest_init+0x88/0xb0
[ 110.012416] [<ffffffff807e2fbd>] ? start_kernel+0x3b5/0x412
[ 110.012420] [<ffffffff807e2281>] ? x86_64_start_reservations+0x91/0xb5
[ 110.012424] [<ffffffff807e2394>] ? x86_64_start_kernel+0xef/0x11b
Based on a report by Davide Pesavento <davidepesa@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Tested-by: Hugo Mildenberger <hugo.mildenberger@namir.de>
Tested-by: Bing Zhao <bzhao@marvell.com>
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Due to a semantic changes in flush_workqueue() the current approach of
synchronizing the sysfs handling for connections doesn't work anymore. The
whole approach is actually fully broken and based on assumptions that are
no longer valid.
With the introduction of Simple Pairing support, the creation of low-level
ACL links got changed. This change invalidates the reason why in the past
two independent work queues have been used for adding/removing sysfs
devices. The adding of the actual sysfs device is now postponed until the
host controller successfully assigns an unique handle to that link. So
the real synchronization happens inside the controller and not the host.
The only left-over problem is that some internals of the sysfs device
handling are not initialized ahead of time. This leaves potential access
to invalid data and can cause various NULL pointer dereferences. To fix
this a new function makes sure that all sysfs details are initialized
when an connection attempt is made. The actual sysfs device is only
registered when the connection has been successfully established. To
avoid a race condition with the registration, the check if a device is
registered has been moved into the removal work.
As an extra protection two flush_work() calls are left in place to
make sure a previous add/del work has been completed first.
Based on a report by Marc Pignat <marc.pignat@hevs.ch>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Tested-by: Justin P. Mattock <justinmattock@gmail.com>
Tested-by: Roger Quadros <ext-roger.quadros@nokia.com>
Tested-by: Marc Pignat <marc.pignat@hevs.ch>
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