1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index ac278ac908d5..b71888b909a0 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -89,6 +89,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/ata.h>
 #include <linux/hdreg.h>
 #include <linux/platform_device.h>
@@ -901,11 +902,14 @@ static int ace_open(struct block_device *bdev, fmode_t mode)
 
         dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);
 
+        lock_kernel();
         spin_lock_irqsave(&ace->lock, flags);
         ace->users++;
         spin_unlock_irqrestore(&ace->lock, flags);
 
         check_disk_change(bdev);
+        unlock_kernel();
+
         return 0;
 }
 
@@ -917,6 +921,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
 
         dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);
 
+        lock_kernel();
         spin_lock_irqsave(&ace->lock, flags);
         ace->users--;
         if (ace->users == 0) {
@@ -924,6 +929,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
                 ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
         }
         spin_unlock_irqrestore(&ace->lock, flags);
+        unlock_kernel();
         return 0;
 }