linux-kernel - [PATCH 3.12 117/123] rbd: use GFP_NOIO in rbd_obj_request

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Message-Id: <1378d900668add705a7d0ae61c7ceca6314a715a.1438699154.git.jslaby@suse.cz>
Date:	Tue,  4 Aug 2015 16:41:01 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 117/123] rbd: use GFP_NOIO in rbd_obj_request_create()

From: Ilya Dryomov <idryomov@...il.com>

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

===============

commit 5a60e87603c4c533492c515b7f62578189b03c9c upstream.

rbd_obj_request_create() is called on the main I/O path, so we need to
use GFP_NOIO to make sure allocation doesn't blow back on us.  Not all
callers need this, but I'm still hardcoding the flag inside rather than
making it a parameter because a) this is going to stable, and b) those
callers shouldn't really use rbd_obj_request_create() and will be fixed
in the future.

More memory allocation fixes will follow.

Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Alex Elder <elder@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/block/rbd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 78bfd5021827..6aeaa28f94f0 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1845,11 +1845,11 @@ static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
 	rbd_assert(obj_request_type_valid(type));
 
 	size = strlen(object_name) + 1;
-	name = kmalloc(size, GFP_KERNEL);
+	name = kmalloc(size, GFP_NOIO);
 	if (!name)
 		return NULL;
 
-	obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL);
+	obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO);
 	if (!obj_request) {
 		kfree(name);
 		return NULL;
-- 
2.5.0

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