On 01/07/15 15:20, Christoph Hellwig wrote:
> 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@xxxxxx>
> Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
> ---
> 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;
>
Reviewed-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
(note: I have been asked to use my company e-mail address for kernel
related work)
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