block: set default max segment size in case of virt_boundary

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>
Link: https://lore.kernel.org/r/20240424134722.2584284-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-settings.c b/block/blk-settings.c
index d2731843f2fccb481eda94e1a1dc980051d2486a..9d6033e01f2e170307cbe5ffdb0365d1eb5c8b9b 100644 (file)
--- 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