| Message ID | 5eceeb9ad825beb87db03b0989f746dfbe0cf3fe.1470753817.git.tom.ty89@gmail.com |
|---|---|
| State | Not Applicable |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 2bdb5da..6fee950 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -1205,7 +1205,8 @@ static int ata_scsi_dev_config(struct scsi_device *sdev, dev->flags |= ATA_DFLAG_NO_UNLOAD; /* configure max sectors */ - blk_queue_max_hw_sectors(q, dev->max_sectors); + if (dev->max_sectors) + blk_queue_max_hw_sectors(q, dev->max_sectors); if (dev->class == ATA_DEV_ATAPI) { void *buf;
From: Tom Yan <tom.ty89@gmail.com> When the request queue is initialized (see __scsi_init_queue() in scsi_lib.c), the block layer limit max_hw_sectors is set to shost->max_sectors, which will be set to the "machine infinity" SCSI_DEFAULT_MAX_SECTORS (currently 1024) if sht->max_sectors is not set (see scsi_host_alloc() in hosts.c). Therefore, if dev->max_sectors is not set (or, initialized to 0), we do not call blk_queue_max_hw_sectors() again with that.