linux-kernel - [patch resend 2/3] block, drbd: fix drbd_req

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Message-ID: <alpine.DEB.2.10.1503241622090.21805@chino.kir.corp.google.com>
Date:	Tue, 24 Mar 2015 16:22:32 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>
cc:	Tejun Heo <tj@...nel.org>,
	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	drbd-user@...ts.linbit.com, linux-kernel@...r.kernel.org
Subject: [patch resend 2/3] block, drbd: fix drbd_req_new() initialization

mempool_alloc() does not support __GFP_ZERO since elements may come from
memory that has already been released by mempool_free().

Remove __GFP_ZERO from mempool_alloc() in drbd_req_new() and properly
initialize it to 0.

Cc: Lars Ellenberg <drbd-dev@...ts.linbit.com>
Cc: Jens Axboe <axboe@...com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 drivers/block/drbd/drbd_req.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -52,9 +52,10 @@ static struct drbd_request *drbd_req_new(struct drbd_device *device,
 {
 	struct drbd_request *req;
 
-	req = mempool_alloc(drbd_request_mempool, GFP_NOIO | __GFP_ZERO);
+	req = mempool_alloc(drbd_request_mempool, GFP_NOIO);
 	if (!req)
 		return NULL;
+	memset(req, 0, sizeof(*req));
 
 	drbd_req_make_private_bio(req, bio_src);
 	req->rq_state    = bio_data_dir(bio_src) == WRITE ? RQ_WRITE : 0;
--
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