block: autoconvert trivial BKL users to private mutex

The block device drivers have all gained new lock_kernel
calls from a recent pushdown, and some of the drivers
were already using the BKL before.

This turns the BKL into a set of per-driver mutexes.
Still need to check whether this is safe to do.

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>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index d3f1a08..02362ec 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -18,11 +18,12 @@
 #include <linux/kthread.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/memstick.h>
 
 #define DRIVER_NAME "mspro_block"
 
+static DEFINE_MUTEX(mspro_block_mutex);
 static int major;
 module_param(major, int, 0644);
 
@@ -180,7 +181,7 @@ static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode)
 	struct mspro_block_data *msb = disk->private_data;
 	int rc = -ENXIO;
 
-	lock_kernel();
+	mutex_lock(&mspro_block_mutex);
 	mutex_lock(&mspro_block_disk_lock);
 
 	if (msb && msb->card) {
@@ -192,7 +193,7 @@ static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode)
 	}
 
 	mutex_unlock(&mspro_block_disk_lock);
-	unlock_kernel();
+	mutex_unlock(&mspro_block_mutex);
 
 	return rc;
 }
@@ -225,9 +226,9 @@ static int mspro_block_disk_release(struct gendisk *disk)
 static int mspro_block_bd_release(struct gendisk *disk, fmode_t mode)
 {
 	int ret;
-	lock_kernel();
+	mutex_lock(&mspro_block_mutex);
 	ret = mspro_block_disk_release(disk);
-	unlock_kernel();
+	mutex_unlock(&mspro_block_mutex);
 	return ret;
 }