swsusp: fix error paths in snapshot_open

We forget to increase device_available if there's an error in snapshot_open(),
so the snapshot device cannot be open at all after snapshot_open() has
returned an error.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 845acd84cb23..bd1771f7a64e 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -49,12 +49,14 @@ static int snapshot_open(struct inode *inode, struct file *filp)
         if (!atomic_add_unless(&device_available, -1, 0))
                 return -EBUSY;
 
-        if ((filp->f_flags & O_ACCMODE) == O_RDWR)
+        if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
+                atomic_inc(&device_available);
                 return -ENOSYS;
-
-        if(create_basic_memory_bitmaps())
+        }
+        if(create_basic_memory_bitmaps()) {
+                atomic_inc(&device_available);
                 return -ENOMEM;
-
+        }
         nonseekable_open(inode, filp);
         data = &snapshot_state;
         filp->private_data = data;