scsi: stop passing a gfp_mask argument down the command setup path

There is no reason for ULDs to pass in a flag on how to allocate the S/G
lists.  While we don't need GFP_ATOMIC for the blk-mq case because we
don't hold locks, that decision can be made way down the chain without
having to pass a pointless gfp_mask argument.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>

4 files changed, 14 insertions, 16 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2179851cdaf3..fcdc585278bf 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -588,10 +588,10 @@ static void scsi_free_sgtable(struct scsi_data_buffer *sdb, bool mq)
         __sg_free_table(&sdb->table, SCSI_MAX_SG_SEGMENTS, mq, scsi_sg_free);
 }
 
-static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents,
-                              gfp_t gfp_mask, 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);
@@ -1077,8 +1077,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
         }
 }
 
-static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
-                             gfp_t gfp_mask)
+static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb)
 {
         int count;
 
@@ -1086,7 +1085,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
          * If sg table allocation fails, requeue request later.
          */
         if (unlikely(scsi_alloc_sgtable(sdb, req->nr_phys_segments,
-                                        gfp_mask, req->mq_ctx != NULL)))
+                                        req->mq_ctx != NULL)))
                 return BLKPREP_DEFER;
 
         /* 
@@ -1111,7 +1110,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
  *              BLKPREP_DEFER if the failure is retryable
  *              BLKPREP_KILL if the failure is fatal
  */
-int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
+int scsi_init_io(struct scsi_cmnd *cmd)
 {
         struct scsi_device *sdev = cmd->device;
         struct request *rq = cmd->request;
@@ -1120,7 +1119,7 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 
         BUG_ON(!rq->nr_phys_segments);
 
-        error = scsi_init_sgtable(rq, &cmd->sdb, gfp_mask);
+        error = scsi_init_sgtable(rq, &cmd->sdb);
         if (error)
                 goto err_exit;
 
@@ -1136,8 +1135,7 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
                         rq->next_rq->special = bidi_sdb;
                 }
 
-                error = scsi_init_sgtable(rq->next_rq, rq->next_rq->special,
-                                          GFP_ATOMIC);
+                error = scsi_init_sgtable(rq->next_rq, rq->next_rq->special);
                 if (error)
                         goto err_exit;
         }
@@ -1149,7 +1147,7 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
                 BUG_ON(prot_sdb == NULL);
                 ivecs = blk_rq_count_integrity_sg(rq->q, rq->bio);
 
-                if (scsi_alloc_sgtable(prot_sdb, ivecs, gfp_mask, is_mq)) {
+                if (scsi_alloc_sgtable(prot_sdb, ivecs, is_mq)) {
                         error = BLKPREP_DEFER;
                         goto err_exit;
                 }
@@ -1218,7 +1216,7 @@ static int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
          * submit a request without an attached bio.
          */
         if (req->bio) {
-                int ret = scsi_init_io(cmd, GFP_ATOMIC);
+                int ret = scsi_init_io(cmd);
                 if (unlikely(ret))
                         return ret;
         } else {
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 95bfb7bfbb9d..f2e9b1dad574 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -786,7 +786,7 @@ static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
          * amount of blocks described by the request.
          */
         blk_add_request_payload(rq, page, len);
-        ret = scsi_init_io(cmd, GFP_ATOMIC);
+        ret = scsi_init_io(cmd);
         rq->__data_len = nr_bytes;
 
 out:
@@ -880,7 +880,7 @@ static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
          * knows how much to actually write.
          */
         rq->__data_len = sdp->sector_size;
-        ret = scsi_init_io(cmd, GFP_ATOMIC);
+        ret = scsi_init_io(cmd);
         rq->__data_len = nr_bytes;
         return ret;
 }
@@ -914,7 +914,7 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
         int ret;
         unsigned char protect;
 
-        ret = scsi_init_io(SCpnt, GFP_ATOMIC);
+        ret = scsi_init_io(SCpnt);
         if (ret != BLKPREP_OK)
                 goto out;
         SCpnt = rq->special;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 3d5399e341af..5ebadc2ace9b 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -387,7 +387,7 @@ static int sr_init_command(struct scsi_cmnd *SCpnt)
         struct request *rq = SCpnt->request;
         int ret;
 
-        ret = scsi_init_io(SCpnt, GFP_ATOMIC);
+        ret = scsi_init_io(SCpnt);
         if (ret != BLKPREP_OK)
                 goto out;
         SCpnt = rq->special;
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index e119142e565e..9fc1aecfc813 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -163,7 +163,7 @@ extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
                                  size_t *offset, size_t *len);
 extern void scsi_kunmap_atomic_sg(void *virt);
 
-extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
+extern int scsi_init_io(struct scsi_cmnd *cmd);
 
 extern int scsi_dma_map(struct scsi_cmnd *cmd);
 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);