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

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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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-06-17 14:19:54 +02:00 committed by Martin K. Petersen
parent 7ad388d8e4
commit bdd17bdef7
1 changed files with 2 additions and 0 deletions
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drivers/scsi/scsi_lib.c
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@ -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);