[PATCH] scsi: storvsc: set max_segment_size as UINT_MAX explicitly

Ming Lei
2025-06-16T16:05:26Z

Set max_segment_size as UINT_MAX explicitly:

- storvrc uses virt_boundary to define `segment`

- strovrc does not define max_segment_size

So define max_segment_size as UINT_MAX, otherwise __blk_rq_map_sg() takes
default 64K max segment size and splits one virtual segment into two parts,
then breaks virt_boundary limit.

Before commit ec84ca4025c0 ("scsi: block: Remove now unused queue limits helpers"),
max segment size is set as UINT_MAX in case that virt_boundary is
defined.

Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Laurence Oberman <loberman@redhat.com>
Fixes: ec84ca4025c0 ("scsi: block: Remove now unused queue limits helpers")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/scsi/storvsc_drv.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 2e6b2412d2c9..1e7ad85f4ba3 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1897,6 +1897,7 @@ static struct scsi_host_template scsi_driver = {
.no_write_same = 1,
.track_queue_depth = 1,
.change_queue_depth = storvsc_change_queue_depth,
+ .max_segment_size = 0xffffffff,
};

enum {
--
2.47.0