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blk-mq-dma: initialize the dma state for P2P, too

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blk_rq_dma_map_iter_start() promises that the caller need not initialize
the dma_iova_state, but the P2P bus address path returns before it does
so. The state then holds what the last request with that tag left, and
blk_rq_dma_map_coalesce() describes a transfer as one IOVA range that it
isn't. Clear it on that path too.

Fixes: 858299dc61 ("block: add scatterlist-less DMA mapping helpers")
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20261028164415.1262013-33-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik 2026-10-28 10:41:35 -06:00 committed by Jens Axboe
parent 0db9f8968a
commit 035236c9e1
1 changed files with 2 additions and 0 deletions
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2
block/blk-mq-dma.c
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@ -181,6 +181,8 @@ static bool blk_dma_map_iter_start(struct request *req, struct device *dma_dev,
switch (pci_p2pdma_state(&iter->p2pdma, dma_dev,
phys_to_page(vec.paddr))) {
case PCI_P2PDMA_MAP_BUS_ADDR:
/* don't leave the state of an earlier mapping to the caller */
memset(state, 0, sizeof(*state));
return blk_dma_map_bus(iter, &vec);
case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE:
/*