[PATCH 2/8] scsi: take the DMA max mapping size into account
From: Christoph Hellwig <hch@lst.de>
Date: 2019-06-17 12:20:14
Also in:
linux-rdma, linux-scsi, lkml
Subsystem:
scsi subsystem, the rest · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
We need to limit the devices max_sectors to what the DMA mapping implementation can support. If not we risk running out of swiotlb buffers easily. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/scsi/scsi_lib.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index d333bb6b1c59..f233bfd84cd7 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c@@ -1768,6 +1768,8 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q) blk_queue_max_integrity_segments(q, shost->sg_prot_tablesize); } + shost->max_sectors = min_t(unsigned int, shost->max_sectors, + dma_max_mapping_size(dev) << SECTOR_SHIFT); blk_queue_max_hw_sectors(q, shost->max_sectors); if (shost->unchecked_isa_dma) blk_queue_bounce_limit(q, BLK_BOUNCE_ISA);
--
2.20.1