From: Christoph Hellwig <hch@lst.de>
To: linux-scsi@vger.kernel.org
Subject: [PATCH] scsi: ->queue_rq can't sleep
Date: Wed, 7 Jan 2015 15:20:53 +0100 [thread overview]
Message-ID: <1420640453-3493-1-git-send-email-hch@lst.de> (raw)
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@lst.de>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
---
drivers/scsi/scsi_lib.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9ea95dd..6d5c0b8 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -591,7 +591,6 @@ static void scsi_free_sgtable(struct scsi_data_buffer *sdb, bool mq)
static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents, bool mq)
{
struct scatterlist *first_chunk = NULL;
- gfp_t gfp_mask = mq ? GFP_NOIO : GFP_ATOMIC;
int ret;
BUG_ON(!nents);
@@ -606,7 +605,7 @@ static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents, bool mq)
}
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;
--
1.9.1
next reply other threads:[~2015-01-07 14:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-07 14:20 Christoph Hellwig [this message]
2015-01-09 11:51 ` [PATCH] scsi: ->queue_rq can't sleep Christoph Hellwig
2015-01-09 15:48 ` Jens Axboe
2015-01-09 12:41 ` Bart Van Assche
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