[PATCH] block: set default max segment size in case of virt_boundary

[Ming Lei <ming.lei@redhat.com>]

For devices with virt_boundary limit, the driver may provide zero max
segment size, we have to set it as UINT_MAX at default. Otherwise, it
may cause warning in driver when handling sglist.

Fix it by setting default max segment size as UINT_MAX.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Mike Snitzer <snitzer@kernel.org>
Fixes: b561ea56a264 ("block: allow device to have both virt_boundary_mask and max segment size")
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Closes: https://lore.kernel.org/linux-block/7e38b67c-9372-a42d-41eb-abdce33d3372@linux-m68k.org/
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 block/blk-settings.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index d2731843f2fc..9d6033e01f2e 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -188,7 +188,10 @@ static int blk_validate_limits(struct queue_limits *lim)
 	 * bvec and lower layer bio splitting is supposed to handle the two
 	 * correctly.
 	 */
-	if (!lim->virt_boundary_mask) {
+	if (lim->virt_boundary_mask) {
+		if (!lim->max_segment_size)
+			lim->max_segment_size = UINT_MAX;
+	} else {
 		/*
 		 * The maximum segment size has an odd historic 64k default that
 		 * drivers probably should override.  Just like the I/O size we
-- 
2.42.0