linux-kernel - [ 022/153] zram: Fix deadlock bug in partial read/write

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Date:	Mon, 04 Mar 2013 03:37:29 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Minchan Kim <minchan@...nel.org>,
	Jerome Marchand <jmarchand@...hat.com>,
	Nitin Gupta <ngupta@...are.org>,
	Pekka Enberg <penberg@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [ 022/153] zram: Fix deadlock bug in partial read/write

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Minchan Kim <minchan@...nel.org>

commit 7e5a5104c6af709a8d97d5f4711e7c917761d464 upstream.

Now zram allocates new page with GFP_KERNEL in zram I/O path
if IO is partial. Unfortunately, It may cause deadlock with
reclaim path like below.

write_page from fs
fs_lock
allocation(GFP_KERNEL)
reclaim
pageout
				write_page from fs
				fs_lock <-- deadlock

This patch fixes it by using GFP_NOIO.  In read path, we
reorganize code flow so that kmap_atomic is called after the
GFP_NOIO allocation.

Acked-by: Jerome Marchand <jmarchand@...hat.com>
Acked-by: Nitin Gupta <ngupta@...are.org>
[ penberg@...nel.org: don't use GFP_ATOMIC ]
Signed-off-by: Pekka Enberg <penberg@...nel.org>
Signed-off-by: Minchan Kim <minchan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.2: no reordering is needed in the read path]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/zram/zram_drv.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -242,7 +242,7 @@ static int zram_bvec_read(struct zram *z
 
 	if (is_partial_io(bvec)) {
 		/* Use  a temporary buffer to decompress the page */
-		uncmem = kmalloc(PAGE_SIZE, GFP_KERNEL);
+		uncmem = kmalloc(PAGE_SIZE, GFP_NOIO);
 		if (!uncmem) {
 			pr_info("Error allocating temp memory!\n");
 			return -ENOMEM;
@@ -338,7 +338,7 @@ static int zram_bvec_write(struct zram *
 		 * This is a partial IO. We need to read the full page
 		 * before to write the changes.
 		 */
-		uncmem = kmalloc(PAGE_SIZE, GFP_KERNEL);
+		uncmem = kmalloc(PAGE_SIZE, GFP_NOIO);
 		if (!uncmem) {
 			pr_info("Error allocating temp memory!\n");
 			ret = -ENOMEM;


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