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authorArnd Bergmann <arnd@arndb.de>2010-06-02 14:28:52 +0200
committerArnd Bergmann <arnd@arndb.de>2010-09-15 21:00:47 +0200
commitd851b6e04ee978b0c1b187bee682592aa72f22ea (patch)
tree1150757f61e3f4391d058fe2efc171e9fbcf13e2 /drivers/macintosh/via-pmu.c
parent5aa82940b23d0c6e4083d48e387a16b8ad530a47 (diff)
downloadop-kernel-dev-d851b6e04ee978b0c1b187bee682592aa72f22ea.zip
op-kernel-dev-d851b6e04ee978b0c1b187bee682592aa72f22ea.tar.gz
mac: 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> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linuxppc-dev@ozlabs.org
Diffstat (limited to 'drivers/macintosh/via-pmu.c')
-rw-r--r--drivers/macintosh/via-pmu.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index 2d17e76..7b8b1de 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -18,7 +18,7 @@
*
*/
#include <stdarg.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
@@ -73,6 +73,7 @@
/* How many iterations between battery polls */
#define BATTERY_POLLING_COUNT 2
+static DEFINE_MUTEX(pmu_info_proc_mutex);
static volatile unsigned char __iomem *via;
/* VIA registers - spaced 0x200 bytes apart */
@@ -2078,7 +2079,7 @@ pmu_open(struct inode *inode, struct file *file)
pp->rb_get = pp->rb_put = 0;
spin_lock_init(&pp->lock);
init_waitqueue_head(&pp->wait);
- lock_kernel();
+ mutex_lock(&pmu_info_proc_mutex);
spin_lock_irqsave(&all_pvt_lock, flags);
#if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
pp->backlight_locker = 0;
@@ -2086,7 +2087,7 @@ pmu_open(struct inode *inode, struct file *file)
list_add(&pp->list, &all_pmu_pvt);
spin_unlock_irqrestore(&all_pvt_lock, flags);
file->private_data = pp;
- unlock_kernel();
+ mutex_unlock(&pmu_info_proc_mutex);
return 0;
}
@@ -2343,9 +2344,9 @@ static long pmu_unlocked_ioctl(struct file *filp,
{
int ret;
- lock_kernel();
+ mutex_lock(&pmu_info_proc_mutex);
ret = pmu_ioctl(filp, cmd, arg);
- unlock_kernel();
+ mutex_unlock(&pmu_info_proc_mutex);
return ret;
}
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