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scsi: core: cap shost max_sectors according to DMA limits only once

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The shost->max_sectors is repeatedly capped according to the host DMA
mapping limit for each sdev in __scsi_init_queue(). This is unnecessary, so
set only once when adding the host.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
John Garry 2022-07-14 19:15:26 +08:00 committed by Christoph Hellwig
parent 6d9870b7e5
commit bb7d1283e6
2 changed files with 5 additions and 4 deletions
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5
drivers/scsi/hosts.c
View File

@ -236,6 +236,11 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
shost->dma_dev = dma_dev;
if (dma_dev->dma_mask) {
shost->max_sectors = min_t(unsigned int, shost->max_sectors,
dma_max_mapping_size(dma_dev) >> SECTOR_SHIFT);
}
error = scsi_mq_setup_tags(shost);
if (error)
goto fail;

4
drivers/scsi/scsi_lib.c
View File

@ -1884,10 +1884,6 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
blk_queue_max_integrity_segments(q, shost->sg_prot_tablesize);
}
if (dev->dma_mask) {
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);
blk_queue_segment_boundary(q, shost->dma_boundary);
dma_set_seg_boundary(dev, shost->dma_boundary);