linux-kernel - [PATCH 3.12 064/113] scsi: move the nr_phys_segments assert into scsi_init

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Message-Id: <b035da658c13ce215a2ef8548867991f99f844e2.1488791431.git.jslaby@suse.cz>
Date:   Mon,  6 Mar 2017 10:11:28 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 064/113] scsi: move the nr_phys_segments assert into scsi_init_io

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 635d98b1d0cfc2ba3426a701725d31a6102c059a upstream.

scsi_init_io should only be called for requests that transfer data,
so move the assert that a request has segments from the callers into
scsi_init_io.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/scsi/scsi_lib.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aeff39767588..a483c979b163 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1025,8 +1025,11 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
 int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 {
 	struct request *rq = cmd->request;
+	int error;
 
-	int error = scsi_init_sgtable(rq, &cmd->sdb, gfp_mask);
+	BUG_ON(!rq->nr_phys_segments);
+
+	error = scsi_init_sgtable(rq, &cmd->sdb, gfp_mask);
 	if (error)
 		goto err_exit;
 
@@ -1128,11 +1131,7 @@ 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;
-
-		BUG_ON(!req->nr_phys_segments);
-
-		ret = scsi_init_io(cmd, GFP_ATOMIC);
+		int ret = scsi_init_io(cmd, GFP_ATOMIC);
 		if (unlikely(ret))
 			return ret;
 	} else {
@@ -1176,11 +1175,6 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
 			return ret;
 	}
 
-	/*
-	 * Filesystem requests must transfer data.
-	 */
-	BUG_ON(!req->nr_phys_segments);
-
 	cmd = scsi_get_cmd_from_req(sdev, req);
 	if (unlikely(!cmd))
 		return BLKPREP_DEFER;
-- 
2.12.0