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authorChristoph Hellwig <hch@lst.de>2019-06-17 14:19:54 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2019-07-16 23:01:49 -0400
commitbdd17bdef7d8da4d8eee254abb4c92d8a566bdc1 (patch)
tree0a93328605a47da7ad488683e54c5d7b2db83ced /drivers/scsi
parent7ad388d8e4c703980b7018b938cdeec58832d78d (diff)
downloadlinux-bdd17bdef7d8da4d8eee254abb4c92d8a566bdc1.tar.bz2
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: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/scsi_lib.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 404e5e28ef62..699623f81dde 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -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);