diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2010-06-02 16:28:52 +0400 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2010-09-15 23:00:48 +0400 |
| commit | 609146fdb319cebce93be550938ab852f7bade90 (patch) | |
| tree | 9cac0f94d17294c2a58ec1d39f86e5d7e5bb1c82 /drivers/char/ipmi/ipmi_watchdog.c | |
| parent | d851b6e04ee978b0c1b187bee682592aa72f22ea (diff) | |
| download | linux-609146fdb319cebce93be550938ab852f7bade90.tar.xz | |
ipmi: 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>
Acked-by: Corey Minyard <cminyard@mvista.com>
Cc: openipmi-developer@lists.sourceforge.net
Diffstat (limited to 'drivers/char/ipmi/ipmi_watchdog.c')
| -rw-r--r-- | drivers/char/ipmi/ipmi_watchdog.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c index 654d566ca57c..ed10b741962d 100644 --- a/drivers/char/ipmi/ipmi_watchdog.c +++ b/drivers/char/ipmi/ipmi_watchdog.c @@ -35,7 +35,7 @@ #include <linux/moduleparam.h> #include <linux/ipmi.h> #include <linux/ipmi_smi.h> -#include <linux/smp_lock.h> +#include <linux/mutex.h> #include <linux/watchdog.h> #include <linux/miscdevice.h> #include <linux/init.h> @@ -149,6 +149,7 @@ #define WDIOC_GET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 22, int) #endif +static DEFINE_MUTEX(ipmi_watchdog_mutex); static int nowayout = WATCHDOG_NOWAYOUT; static ipmi_user_t watchdog_user; @@ -748,9 +749,9 @@ static long ipmi_unlocked_ioctl(struct file *file, { int ret; - lock_kernel(); + mutex_lock(&ipmi_watchdog_mutex); ret = ipmi_ioctl(file, cmd, arg); - unlock_kernel(); + mutex_unlock(&ipmi_watchdog_mutex); return ret; } @@ -844,7 +845,6 @@ static int ipmi_open(struct inode *ino, struct file *filep) if (test_and_set_bit(0, &ipmi_wdog_open)) return -EBUSY; - cycle_kernel_lock(); /* * Don't start the timer now, let it start on the |