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scsi: ->queue_rq can't sleep

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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>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Tested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
This commit is contained in:
Christoph Hellwig 2015-01-05 20:29:38 +01:00
parent 1018b8b90b
commit 70a0f2c189
1 changed files with 1 additions and 2 deletions
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3
drivers/scsi/scsi_lib.c
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@ -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) static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents, bool mq)
{ {
struct scatterlist *first_chunk = NULL; struct scatterlist *first_chunk = NULL;
gfp_t gfp_mask = mq ? GFP_NOIO : GFP_ATOMIC;
int ret; int ret;
BUG_ON(!nents); 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, 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)) if (unlikely(ret))
scsi_free_sgtable(sdb, mq); scsi_free_sgtable(sdb, mq);
return ret; return ret;