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author | Arnd Bergmann <arnd@arndb.de> | 2010-06-02 14:28:52 +0200 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2010-10-05 15:01:04 +0200 |
commit | 613655fa39ff6957754fa8ceb8559980920eb8ee (patch) | |
tree | ad19600cb81207b24188683d7fc4ae88013339d1 /drivers/hwmon/fschmd.c | |
parent | 609146fdb319cebce93be550938ab852f7bade90 (diff) | |
download | linux-613655fa39ff6957754fa8ceb8559980920eb8ee.tar.gz linux-613655fa39ff6957754fa8ceb8559980920eb8ee.tar.bz2 linux-613655fa39ff6957754fa8ceb8559980920eb8ee.zip |
drivers: 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.
These drivers do not seem to be under active
maintainance from my brief investigation. Apologies
to those maintainers that I have missed.
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>
Diffstat (limited to 'drivers/hwmon/fschmd.c')
-rw-r--r-- | drivers/hwmon/fschmd.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hwmon/fschmd.c b/drivers/hwmon/fschmd.c index b7ca2a9676cf..d4d4ca65d371 100644 --- a/drivers/hwmon/fschmd.c +++ b/drivers/hwmon/fschmd.c @@ -38,7 +38,6 @@ #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> -#include <linux/smp_lock.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/sysfs.h> @@ -50,6 +49,7 @@ #include <linux/kref.h> /* Addresses to scan */ +static DEFINE_MUTEX(watchdog_mutex); static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END }; /* Insmod parameters */ @@ -858,7 +858,7 @@ static long watchdog_ioctl(struct file *filp, unsigned int cmd, unsigned long ar int i, ret = 0; struct fschmd_data *data = filp->private_data; - lock_kernel(); + mutex_lock(&watchdog_mutex); switch (cmd) { case WDIOC_GETSUPPORT: ident.firmware_version = data->revision; @@ -915,7 +915,7 @@ static long watchdog_ioctl(struct file *filp, unsigned int cmd, unsigned long ar default: ret = -ENOTTY; } - unlock_kernel(); + mutex_unlock(&watchdog_mutex); return ret; } |