[PATCH] swsusp: Do not fail if resume device is not set

In the kernels later than 2.6.19 there is a regression that makes swsusp
fail if the resume device is not explicitly specified.

It can be fixed by adding an additional parameter to
mm/swapfile.c:swap_type_of() allowing us to pass the (struct block_device
*) corresponding to the first available swap back to the caller.

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

1 files changed, 5 insertions, 4 deletions

diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index f133d4a6d817..3581f8f86acd 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -165,14 +165,15 @@ static int swsusp_swap_check(void) /* This is called before saving image */
 {
         int res;
 
-        res = swap_type_of(swsusp_resume_device, swsusp_resume_block);
+        res = swap_type_of(swsusp_resume_device, swsusp_resume_block,
+                        &resume_bdev);
         if (res < 0)
                 return res;
 
         root_swap = res;
-        resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_WRITE);
-        if (IS_ERR(resume_bdev))
-                return PTR_ERR(resume_bdev);
+        res = blkdev_get(resume_bdev, FMODE_WRITE, O_RDWR);
+        if (res)
+                return res;
 
         res = set_blocksize(resume_bdev, PAGE_SIZE);
         if (res < 0)