summaryrefslogtreecommitdiffstats
path: root/drivers/block/xen-blkfront.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/xen-blkfront.c')
-rw-r--r--drivers/block/xen-blkfront.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 9119cd3..9137428 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -41,6 +41,7 @@
#include <linux/cdrom.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/smp_lock.h>
#include <linux/scatterlist.h>
#include <xen/xen.h>
@@ -1018,13 +1019,18 @@ static int blkfront_is_ready(struct xenbus_device *dev)
static int blkif_open(struct block_device *bdev, fmode_t mode)
{
struct blkfront_info *info = bdev->bd_disk->private_data;
+
+ lock_kernel();
info->users++;
+ unlock_kernel();
+
return 0;
}
static int blkif_release(struct gendisk *disk, fmode_t mode)
{
struct blkfront_info *info = disk->private_data;
+ lock_kernel();
info->users--;
if (info->users == 0) {
/* Check whether we have been instructed to close. We will
@@ -1036,6 +1042,7 @@ static int blkif_release(struct gendisk *disk, fmode_t mode)
if (state == XenbusStateClosing && info->is_ready)
blkfront_closing(dev);
}
+ unlock_kernel();
return 0;
}
OpenPOWER on IntegriCloud