diff options
author | Arnd Bergmann <arnd@arndb.de> | 2010-07-11 21:18:56 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 21:35:39 (GMT) |
commit | 925ce689bb31960c839804c19ef38d676f1939b9 (patch) | |
tree | 620c9b0f054a613d86aaa62901f93019856de0f9 /drivers/usb/misc/iowarrior.c | |
parent | 7c7e2d00435bd8129c4bacb73fe4a2d4db4e7d7c (diff) | |
download | linux-925ce689bb31960c839804c19ef38d676f1939b9.tar.xz |
USB: autoconvert trivial BKL users to private mutex
All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.
None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file operations, meaning that there
is no lock-order inversion problem.
Consequently, we can remove the BKL completely,
replacing it with a per-file mutex in every case.
Using a scripted approach means we can avoid
typos.
file=$1
name=$2
if grep -q lock_kernel ${file} ; then
if grep -q 'include.*linux.mutex.h' ${file} ; then
sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
else
sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
fi
sed -i ${file} \
-e "/^#include.*linux.mutex.h/,$ {
1,/^\(static\|int\|long\)/ {
/^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);
} }" \
-e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
-e '/[ ]*cycle_kernel_lock();/d'
else
sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \
-e '/cycle_kernel_lock()/d'
fi
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/misc/iowarrior.c')
-rw-r--r-- | drivers/usb/misc/iowarrior.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index 7dc9d3c..8296645 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -18,7 +18,7 @@ #include <linux/init.h> #include <linux/slab.h> #include <linux/sched.h> -#include <linux/smp_lock.h> +#include <linux/mutex.h> #include <linux/poll.h> #include <linux/usb/iowarrior.h> @@ -61,6 +61,7 @@ MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); /* Module parameters */ +static DEFINE_MUTEX(iowarrior_mutex); static int debug = 0; module_param(debug, bool, 0644); MODULE_PARM_DESC(debug, "debug=1 enables debugging messages"); @@ -493,7 +494,7 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd, return -ENOMEM; /* lock this object */ - lock_kernel(); + mutex_lock(&iowarrior_mutex); mutex_lock(&dev->mutex); /* verify that the device wasn't unplugged */ @@ -585,7 +586,7 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd, error_out: /* unlock the device */ mutex_unlock(&dev->mutex); - unlock_kernel(); + mutex_unlock(&iowarrior_mutex); kfree(buffer); return retval; } @@ -602,12 +603,12 @@ static int iowarrior_open(struct inode *inode, struct file *file) dbg("%s", __func__); - lock_kernel(); + mutex_lock(&iowarrior_mutex); subminor = iminor(inode); interface = usb_find_interface(&iowarrior_driver, subminor); if (!interface) { - unlock_kernel(); + mutex_unlock(&iowarrior_mutex); err("%s - error, can't find device for minor %d", __func__, subminor); return -ENODEV; @@ -617,7 +618,7 @@ static int iowarrior_open(struct inode *inode, struct file *file) dev = usb_get_intfdata(interface); if (!dev) { mutex_unlock(&iowarrior_open_disc_lock); - unlock_kernel(); + mutex_unlock(&iowarrior_mutex); return -ENODEV; } @@ -644,7 +645,7 @@ static int iowarrior_open(struct inode *inode, struct file *file) out: mutex_unlock(&dev->mutex); - unlock_kernel(); + mutex_unlock(&iowarrior_mutex); return retval; } |