scsi: sd: Quiesce warning if device does not report optimal I/O size

Commit a83da8a4509d ("scsi: sd: Optimal I/O size should be a multiple
of physical block size") split one conditional into several separate
statements in an effort to provide more accurate warning messages when
a device reports a nonsensical value. However, this reorganization
accidentally dropped the precondition of the reported value being
larger than zero. This lead to a warning getting emitted on devices
that do not report an optimal I/O size at all.

Remain silent if a device does not report an optimal I/O size.

Fixes: a83da8a4509d ("scsi: sd: Optimal I/O size should be a multiple of physical block size")
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: <stable@vger.kernel.org>
Reported-by: Hussam Al-Tayeb <ht990332@gmx.com>
Tested-by: Hussam Al-Tayeb <ht990332@gmx.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3ffa34dc2fd513f0818b51fe32c055f7ca7cb404..2b2bc4b49d78a36c737cd9e70666b900ec0fc2b2 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3071,6 +3071,9 @@ static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
        unsigned int opt_xfer_bytes =
                logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
 
+       if (sdkp->opt_xfer_blocks == 0)
+               return false;
+
        if (sdkp->opt_xfer_blocks > dev_max) {
                sd_first_printk(KERN_WARNING, sdkp,
                                "Optimal transfer size %u logical blocks " \