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scsi: move the nr_phys_segments assert into scsi_init_io 

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@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Christoph Hellwig 2014-06-28 11:51:01 +02:00
parent e6c11dbb8d
commit 635d98b1d0
1 changed files with 5 additions and 11 deletions
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16
drivers/scsi/scsi_lib.c
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@ -963,8 +963,11 @@ 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;
@ -1055,11 +1058,7 @@ 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 {
@ -1098,11 +1097,6 @@ 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);
}