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[v5,5/5] ata: libata-scsi: Cap ata_device->max_sectors according to shost->max_sectors

Message ID 1656590892-42307-6-git-send-email-john.garry@huawei.com
State Superseded
Headers show
Series DMA mapping changes for SCSI core | expand

Commit Message

John Garry June 30, 2022, 12:08 p.m. UTC
ATA devices (struct ata_device) have a max_sectors field which is
configured internally in libata. This is then used to (re)configure the
associated sdev request queue max_sectors value from how it is earlier set
in __scsi_init_queue(). In __scsi_init_queue() the max_sectors value is set
according to shost limits, which includes host DMA mapping limits.

Cap the ata_device max_sectors according to shost->max_sectors to respect
this shost limit.

Signed-off-by: John Garry <john.garry@huawei.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
 drivers/ata/libata-scsi.c | 1 +
 1 file changed, 1 insertion(+)
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diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 86dbb1cdfabd..24a43d540d9f 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1060,6 +1060,7 @@  int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
 		dev->flags |= ATA_DFLAG_NO_UNLOAD;
 	/* configure max sectors */
+	dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors);
 	blk_queue_max_hw_sectors(q, dev->max_sectors);
 	if (dev->class == ATA_DEV_ATAPI) {