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Subject[PATCH 2/8] scsi: take the DMA max mapping size into account
Date
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
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