From 2a48fc0ab24241755dc93bfd4f01d68efab47f5a Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 2 Jun 2010 14:28:52 +0200
Subject: 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>
---
 drivers/cdrom/viocd.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

(limited to 'drivers/cdrom/viocd.c')

diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index 56bf9f44700..be73a9b493a 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -42,7 +42,7 @@
 #include <linux/module.h>
 #include <linux/completion.h>
 #include <linux/proc_fs.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/seq_file.h>
 #include <linux/scatterlist.h>
 
@@ -61,6 +61,7 @@
  */
 #define VIOCD_MAX_CD	HVMAXARCHITECTEDVIRTUALCDROMS
 
+static DEFINE_MUTEX(viocd_mutex);
 static const struct vio_error_entry viocd_err_table[] = {
 	{0x0201, EINVAL, "Invalid Range"},
 	{0x0202, EINVAL, "Invalid Token"},
@@ -156,9 +157,9 @@ static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 	struct disk_info *di = bdev->bd_disk->private_data;
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&viocd_mutex);
 	ret = cdrom_open(&di->viocd_info, bdev, mode);
-	unlock_kernel();
+	mutex_unlock(&viocd_mutex);
 
 	return ret;
 }
@@ -166,9 +167,9 @@ static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
 {
 	struct disk_info *di = disk->private_data;
-	lock_kernel();
+	mutex_lock(&viocd_mutex);
 	cdrom_release(&di->viocd_info, mode);
-	unlock_kernel();
+	mutex_unlock(&viocd_mutex);
 	return 0;
 }
 
@@ -178,9 +179,9 @@ static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
 	struct disk_info *di = bdev->bd_disk->private_data;
 	int ret;
 
-	lock_kernel();
+	mutex_lock(&viocd_mutex);
 	ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&viocd_mutex);
 
 	return ret;
 }
-- 
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