Commit a0750fae73c5 for kernel

commit a0750fae73c55112ea11a4867bee40f11e679405
Author: Keith Busch <kbusch@kernel.org>
Date:   Wed Dec 10 02:43:46 2025 -0800

    blk-mq-dma: always initialize dma state

    Ensure the dma state is initialized when we're not using the contiguous
    iova, otherwise the caller may be using a stale state from a previous
    request that could use the coalesed iova allocation.

    Fixes: 2f6b2565d43cdb5 ("block: accumulate memory segment gaps per bio")
    Reported-by: Sebastian Ott <sebott@redhat.com>
    Tested-by: Sebastian Ott <sebott@redhat.com>
    Signed-off-by: Keith Busch <kbusch@kernel.org>
    Reviewed-by: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-mq-dma.c b/block/blk-mq-dma.c
index e9108ccaf4b0..6dc7a3c23ac8 100644
--- a/block/blk-mq-dma.c
+++ b/block/blk-mq-dma.c
@@ -199,6 +199,7 @@ static bool blk_dma_map_iter_start(struct request *req, struct device *dma_dev,
 	if (blk_can_dma_map_iova(req, dma_dev) &&
 	    dma_iova_try_alloc(dma_dev, state, vec.paddr, total_len))
 		return blk_rq_dma_map_iova(req, dma_dev, state, iter, &vec);
+	memset(state, 0, sizeof(*state));
 	return blk_dma_map_direct(req, dma_dev, iter, &vec);
 }