Commit bdd17bde authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Martin K. Petersen
Browse files

scsi: core: take the DMA max mapping size into account 



We need to limit the device's max_sectors to what the DMA mapping
implementation can support.  If not, we risk running out of swiotlb
buffers easily.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 7ad388d8

drivers/scsi/scsi_lib.c

+2 −0
Original line number Diff line number Diff line
@@ -1784,6 +1784,8 @@ 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);

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