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>

2 files changed, 10 insertions, 8 deletions

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index ff1d24720f11..8284297b30e9 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -25,7 +25,7 @@
 #include <linux/major.h>
 #include <linux/delay.h>
 #include <linux/hdreg.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/slab.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -124,6 +124,7 @@ struct blkvsc_driver_context {
 };
 
 /* Static decl */
+static DEFINE_MUTEX(blkvsc_mutex);
 static int blkvsc_probe(struct device *dev);
 static int blkvsc_remove(struct device *device);
 static void blkvsc_shutdown(struct device *device);
@@ -1309,7 +1310,7 @@ static int blkvsc_open(struct block_device *bdev, fmode_t mode)
 	DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
 		   blkdev->gd->disk_name);
 
-	lock_kernel();
+	mutex_lock(&blkvsc_mutex);
 	spin_lock(&blkdev->lock);
 
 	if (!blkdev->users && blkdev->device_type == DVD_TYPE) {
@@ -1321,7 +1322,7 @@ static int blkvsc_open(struct block_device *bdev, fmode_t mode)
 	blkdev->users++;
 
 	spin_unlock(&blkdev->lock);
-	unlock_kernel();
+	mutex_unlock(&blkvsc_mutex);
 	return 0;
 }
 
@@ -1332,7 +1333,7 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
 	DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
 		   blkdev->gd->disk_name);
 
-	lock_kernel();
+	mutex_lock(&blkvsc_mutex);
 	spin_lock(&blkdev->lock);
 	if (blkdev->users == 1) {
 		spin_unlock(&blkdev->lock);
@@ -1343,7 +1344,7 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
 	blkdev->users--;
 
 	spin_unlock(&blkdev->lock);
-	unlock_kernel();
+	mutex_unlock(&blkvsc_mutex);
 	return 0;
 }
 
diff --git a/drivers/staging/spectra/ffsport.c b/drivers/staging/spectra/ffsport.c
index fa21a0fd8e84..c7932da03c56 100644
--- a/drivers/staging/spectra/ffsport.c
+++ b/drivers/staging/spectra/ffsport.c
@@ -27,7 +27,6 @@
 #include <linux/kthread.h>
 #include <linux/log2.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
 #include <linux/slab.h>
 
 /**** Helper functions used for Div, Remainder operation on u64 ****/
@@ -590,14 +589,16 @@ int GLOB_SBD_ioctl(struct block_device *bdev, fmode_t mode,
 	return -ENOTTY;
 }
 
+static DEFINE_MUTEX(ffsport_mutex);
+
 int GLOB_SBD_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
 		unsigned int cmd, unsigned long arg)
 {
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&ffsport_mutex);
 	ret = GLOB_SBD_ioctl(bdev, mode, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&ffsport_mutex);
 
 	return ret;
 }