[PATCH] scsi_lib: Align max_sectors to kb

Hannes Reinecke
2024-04-18T07:00:20Z

max_sectors can be modified via sysfs, but only in kb units.
Which leads to a misalignment on stacked devices if the original
max_sector size is an odd number. So align the max_sectors setting
to kb to avoid this issue.

Reported-by: Martin Wilck <martin.wilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
drivers/scsi/scsi_lib.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2e28e2360c85..aad2ac1353d1 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1983,7 +1983,8 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
blk_queue_max_integrity_segments(q, shost->sg_prot_tablesize);
}

- blk_queue_max_hw_sectors(q, shost->max_sectors);
+ /* Align to kb to avoid conflicts with Sysfs settings */
+ blk_queue_max_hw_sectors(q, shost->max_sectors & ~0x1);
blk_queue_segment_boundary(q, shost->dma_boundary);
dma_set_seg_boundary(dev, shost->dma_boundary);

--
2.35.3