scsi: sd: sr: Convert two assignments into warning statements

Before scsi_prep_fn() calls the ULP .init_command() callback
function it stores the SCSI command pointer in request.special.
This means that the SCpnt = rq->special assignments in the sd
and sr drivers assign a pointer to itself. Hence convert these
two assignment statements into warning statements.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index bea36ad..a88639f 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1013,7 +1013,7 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
        ret = scsi_init_io(SCpnt);
        if (ret != BLKPREP_OK)
                goto out;
-       SCpnt = rq->special;
+       WARN_ON_ONCE(SCpnt != rq->special);
 
        /* from here on until we're complete, any goto out
         * is used for a killable error condition */

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index a8f6302..9be34d3 100644 (file)
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -393,7 +393,7 @@ static int sr_init_command(struct scsi_cmnd *SCpnt)
        ret = scsi_init_io(SCpnt);
        if (ret != BLKPREP_OK)
                goto out;
-       SCpnt = rq->special;
+       WARN_ON_ONCE(SCpnt != rq->special);
        cd = scsi_cd(rq->rq_disk);
 
        /* from here on until we're complete, any goto out