>>>>> "Tom" == tom ty89 <tom.ty89@xxxxxxxxx> writes:
Tom,
Tom> The SCSI disk driver sets max_sectors to BLK_DEF_MAX_SECTORS when
Tom> the device does not report Optimal Transfer Length. However, it
Tom> checks only whether it is smaller than max_hw_sectors, but not
Tom> max_dev_sectors.
It would be pretty unusual for a device that is smart enough to report a
transfer length limit to be constrained to 1 MB and change.
@@ -2875,8 +2875,11 @@ static int sd_revalidate_disk(struct gendisk *disk)
logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
- } else
+ } else {
rw_max = BLK_DEF_MAX_SECTORS;
+ /* Combine with device limits */
+ rw_max = min(rw_max, q->limits.max_dev_sectors);
+ }
/* Combine with controller limits */
q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
If you want to fix this please drop the braces and do:
rw_max = min(BLK_DEF_MAX_SECTORS, q->limits.max_dev_sectors);
--
Martin K. Petersen Oracle Linux Engineering
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