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authorArnd Bergmann <arnd@arndb.de>2010-06-02 14:28:52 +0200
committerArnd Bergmann <arnd@arndb.de>2010-10-05 15:01:04 +0200
commit613655fa39ff6957754fa8ceb8559980920eb8ee (patch)
treead19600cb81207b24188683d7fc4ae88013339d1 /drivers/hwmon/w83793.c
parentipmi: autoconvert trivial BKL users to private mutex (diff)
downloadlinux-dev-613655fa39ff6957754fa8ceb8559980920eb8ee.tar.xz
linux-dev-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/w83793.c')
-rw-r--r--drivers/hwmon/w83793.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hwmon/w83793.c b/drivers/hwmon/w83793.c
index 697202e27891..8e540ada47d2 100644
--- a/drivers/hwmon/w83793.c
+++ b/drivers/hwmon/w83793.c
@@ -35,7 +35,6 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
-#include <linux/smp_lock.h>
#include <linux/hwmon-vid.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
@@ -52,6 +51,7 @@
#define WATCHDOG_TIMEOUT 2 /* 2 minute default timeout */
/* Addresses to scan */
+static DEFINE_MUTEX(watchdog_mutex);
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
I2C_CLIENT_END };
@@ -1333,7 +1333,7 @@ static long watchdog_ioctl(struct file *filp, unsigned int cmd,
int val, ret = 0;
struct w83793_data *data = filp->private_data;
- lock_kernel();
+ mutex_lock(&watchdog_mutex);
switch (cmd) {
case WDIOC_GETSUPPORT:
if (!nowayout)
@@ -1387,7 +1387,7 @@ static long watchdog_ioctl(struct file *filp, unsigned int cmd,
default:
ret = -ENOTTY;
}
- unlock_kernel();
+ mutex_unlock(&watchdog_mutex);
return ret;
}