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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/adb.c
parent5aa82940b23d0c6e4083d48e387a16b8ad530a47 (diff)
downloadblackbird-op-linux-d851b6e04ee978b0c1b187bee682592aa72f22ea.tar.gz
blackbird-op-linux-d851b6e04ee978b0c1b187bee682592aa72f22ea.zip
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/adb.c')
-rw-r--r--drivers/macintosh/adb.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/macintosh/adb.c b/drivers/macintosh/adb.c
index 1c4ee6e77937..e75e3be50811 100644
--- a/drivers/macintosh/adb.c
+++ b/drivers/macintosh/adb.c
@@ -24,7 +24,6 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/sched.h>
-#include <linux/smp_lock.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>
@@ -55,6 +54,7 @@ extern struct adb_driver adb_iop_driver;
extern struct adb_driver via_pmu_driver;
extern struct adb_driver macio_adb_driver;
+static DEFINE_MUTEX(adb_mutex);
static struct adb_driver *adb_driver_list[] = {
#ifdef CONFIG_ADB_MACII
&via_macii_driver,
@@ -647,7 +647,7 @@ static int adb_open(struct inode *inode, struct file *file)
struct adbdev_state *state;
int ret = 0;
- lock_kernel();
+ mutex_lock(&adb_mutex);
if (iminor(inode) > 0 || adb_controller == NULL) {
ret = -ENXIO;
goto out;
@@ -665,7 +665,7 @@ static int adb_open(struct inode *inode, struct file *file)
state->inuse = 1;
out:
- unlock_kernel();
+ mutex_unlock(&adb_mutex);
return ret;
}
@@ -674,7 +674,7 @@ static int adb_release(struct inode *inode, struct file *file)
struct adbdev_state *state = file->private_data;
unsigned long flags;
- lock_kernel();
+ mutex_lock(&adb_mutex);
if (state) {
file->private_data = NULL;
spin_lock_irqsave(&state->lock, flags);
@@ -687,7 +687,7 @@ static int adb_release(struct inode *inode, struct file *file)
spin_unlock_irqrestore(&state->lock, flags);
}
}
- unlock_kernel();
+ mutex_unlock(&adb_mutex);
return 0;
}
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