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author | Alexandre Bounine <alexandre.bounine@idt.com> | 2013-07-03 22:08:53 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 23:08:04 (GMT) |
commit | 9edbc30b434f56258d03faac5daf37a555384db3 (patch) | |
tree | d6454e8d28a6177d31f91bf081bb0602b8c73056 /drivers/rapidio/rio-sysfs.c | |
parent | e6161d64263ee7a903acdde1a8ab7d4221d5512f (diff) | |
download | linux-9edbc30b434f56258d03faac5daf37a555384db3.tar.xz |
rapidio: update enumerator registration mechanism
Update enumeration/discovery method registration mechanism to allow
loading enumeration/discovery methods before all mports are registered.
Existing statically linked RapidIO subsystem expects that all available
RapidIO mport devices are initialized and registered before the
enumeration/discovery method is registered. Switching to loadable mport
device drivers creates situation when mport device driver can be loaded
after enumeration/discovery method is attached (e.g., loadable mport
driver in a system with statically linked RapidIO core and enumerator).
This also will happen in a system with hot-pluggable RapidIO controllers.
To remove the dependency on the initialization/registration order this
patch introduces enumeration/discovery registration mechanism that
supports arbitrary registration order of mports and enumerator/discovery
methods.
The following registration rules are implemented:
- only one enumeration/discovery method can be registered for given mport ID
(including RIO_MPORT_ANY);
- when new enumeration/discovery methods tries to attach to the registered mport
device, method with matching mport ID will replace a default method previously
registered for given mport (if any);
- enumeration/discovery method with target ID=RIO_MPORT_ANY will be attached
only to mports that do not have another enumerator attached to them;
- when new mport device is registered with RapidIO subsystem, registration
routine searches for the enumeration/discovery method with the best matching
mport ID;
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@Prodrive.nl>
Cc: Micha Nelissen <micha.nelissen@Prodrive.nl>
Cc: Stef van Os <stef.van.os@Prodrive.nl>
Cc: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio/rio-sysfs.c')
-rw-r--r-- | drivers/rapidio/rio-sysfs.c | 17 |
1 files changed, 1 insertions, 16 deletions
diff --git a/drivers/rapidio/rio-sysfs.c b/drivers/rapidio/rio-sysfs.c index 864e52f..0c4473e 100644 --- a/drivers/rapidio/rio-sysfs.c +++ b/drivers/rapidio/rio-sysfs.c @@ -286,7 +286,6 @@ static ssize_t bus_scan_store(struct bus_type *bus, const char *buf, size_t count) { long val; - struct rio_mport *port = NULL; int rc; if (kstrtol(buf, 0, &val) < 0) @@ -300,21 +299,7 @@ static ssize_t bus_scan_store(struct bus_type *bus, const char *buf, if (val < 0 || val >= RIO_MAX_MPORTS) return -EINVAL; - port = rio_find_mport((int)val); - - if (!port) { - pr_debug("RIO: %s: mport_%d not available\n", - __func__, (int)val); - return -EINVAL; - } - - if (!port->nscan) - return -EINVAL; - - if (port->host_deviceid >= 0) - rc = port->nscan->enumerate(port, 0); - else - rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT); + rc = rio_mport_scan((int)val); exit: if (!rc) rc = count; |