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@xxxxxx> --- 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
