Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754070Ab3DMNi6 (ORCPT ); Sat, 13 Apr 2013 09:38:58 -0400 Received: from mail-pd0-f178.google.com ([209.85.192.178]:63487 "EHLO mail-pd0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753509Ab3DMNiy (ORCPT ); Sat, 13 Apr 2013 09:38:54 -0400 From: Namjae Jeon To: dwmw2@infradead.org, axboe@kernel.dk, shli@kernel.org, Paul.Clements@steeleye.com, npiggin@kernel.dk, neilb@suse.de, cjb@laptop.org, adrian.hunter@intel.com Cc: linux-mtd@lists.infradead.org, nbd-general@lists.sourceforge.net, linux-raid@vger.kernel.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Namjae Jeon , Namjae Jeon , Vivek Trivedi Subject: [PATCH 3/8] mtd: use generic helper to set max_discard_sectors Date: Sat, 13 Apr 2013 22:38:44 +0900 Message-Id: <1365860324-21295-1-git-send-email-linkinjeon@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1385 Lines: 42 From: Namjae Jeon It is better to use blk_queue_max_discard_sectors helper function to set max_discard_sectors as it checks max_discard_sectors upper limit UINT_MAX >> 9 similar issue was reported for mmc in below link https://lkml.org/lkml/2013/4/1/292 If multiple discard requests get merged, merged discard request's size exceeds 4GB, there is possibility that merged discard request's __data_len field may overflow. This patch fixes this issue. Signed-off-by: Namjae Jeon Signed-off-by: Vivek Trivedi --- drivers/mtd/mtd_blkdevs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index 5ad39bb..cf35f99 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -417,7 +417,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) if (tr->discard) { queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq); - new->rq->limits.max_discard_sectors = UINT_MAX; + blk_queue_max_discard_sectors(new->rq, UINT_MAX >> 9); } gd->queue = new->rq; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/