linux-kernel - [PATCH AUTOSEL 3.18 29/98] scsi: ->queue

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Message-Id: <20181025141853.214051-29-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:17:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 3.18 29/98] scsi: ->queue_rq can't sleep

From: Christoph Hellwig <hch@....de>

[ Upstream commit 70a0f2c1898c6abf53670e55642b6e840b003892 ]

The blk-mq ->queue_rq method is always called from process context,
but might have preemption disabled.  This means we still always
have to use GFP_ATOMIC for memory allocations, and thus need to
revert part of commit 3c356bde1 ("scsi: stop passing a gfp_mask
argument down the command setup path").

Signed-off-by: Christoph Hellwig <hch@....de>
Reported-by: Sasha Levin <sasha.levin@...cle.com>
Reviewed-by: Bart Van Assche <bart.vanassche@...disk.com>
Tested-by: Alexei Starovoitov <alexei.starovoitov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/scsi_lib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index a11837054d6c..0d5c218b7ad1 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -616,7 +616,7 @@ static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents,
 	}
 
 	ret = __sg_alloc_table(&sdb->table, nents, SCSI_MAX_SG_SEGMENTS,
-			       first_chunk, gfp_mask, scsi_sg_alloc);
+			       first_chunk, GFP_ATOMIC, scsi_sg_alloc);
 	if (unlikely(ret))
 		scsi_free_sgtable(sdb, mq);
 	return ret;
-- 
2.17.1