[PATCH 01/10] scsi: move the nr_phys_segments assert into scsi_init_io

[Christoph Hellwig]

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 <h...@lst.de>
---
 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 37038fb..b505b06 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -996,8 +996,11 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 {
        struct scsi_device *sdev = cmd->device;
        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;
 
@@ -1088,11 +1091,7 @@ 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 {
@@ -1131,11 +1130,6 @@ 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);
-
        memset(cmd->cmnd, 0, BLK_MAX_CDB);
        return scsi_init_io(cmd, GFP_ATOMIC);
 }
-- 
1.7.10.4

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