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, 9 insertions, 8 deletions

diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index 4457b494882a..635f25dd9e10 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -152,9 +152,10 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 
+static DEFINE_MUTEX(pf_mutex);
 static DEFINE_SPINLOCK(pf_spin_lock);
 
 module_param(verbose, bool, 0644);
@@ -302,7 +303,7 @@ static int pf_open(struct block_device *bdev, fmode_t mode)
 	struct pf_unit *pf = bdev->bd_disk->private_data;
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&pf_mutex);
 	pf_identify(pf);
 
 	ret = -ENODEV;
@@ -318,7 +319,7 @@ static int pf_open(struct block_device *bdev, fmode_t mode)
 	if (pf->removable)
 		pf_lock(pf, 1);
 out:
-	unlock_kernel();
+	mutex_unlock(&pf_mutex);
 	return ret;
 }
 
@@ -349,9 +350,9 @@ static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, u
 
 	if (pf->access != 1)
 		return -EBUSY;
-	lock_kernel();
+	mutex_lock(&pf_mutex);
 	pf_eject(pf);
-	unlock_kernel();
+	mutex_unlock(&pf_mutex);
 
 	return 0;
 }
@@ -360,9 +361,9 @@ static int pf_release(struct gendisk *disk, fmode_t mode)
 {
 	struct pf_unit *pf = disk->private_data;
 
-	lock_kernel();
+	mutex_lock(&pf_mutex);
 	if (pf->access <= 0) {
-		unlock_kernel();
+		mutex_unlock(&pf_mutex);
 		return -EINVAL;
 	}
 
@@ -371,7 +372,7 @@ static int pf_release(struct gendisk *disk, fmode_t mode)
 	if (!pf->access && pf->removable)
 		pf_lock(pf, 0);
 
-	unlock_kernel();
+	mutex_unlock(&pf_mutex);
 	return 0;
 
 }