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[PATCH] libata: add per-device max_sectors

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If a low level driver wants to control max_sectors, it had to adjust
ap->host->max_sectors and set ATA_DFLAG_LOCK_SECTORS to tell
ata_scsi_slave_config not to override the limit.  This is not only
cumbersome but also incorrect for hosts which support more than one
devices per port.

This patch adds per-device ->max_sectors.  If the field is unset
(zero), libata core layer will adjust ->max_sectors according to
default rules.  If the field is set, libata honors the setting.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo
2006-02-12 23:32:59 +09:00
committed by Jeff Garzik
parent 6e7846e9c5
commit b00eec1d58
4 changed files with 13 additions and 17 deletions
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4
drivers/scsi/libata-core.c
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@@ -1147,9 +1147,7 @@ void ata_dev_config(struct ata_port *ap, unsigned int i)
printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
ap->id, i);
ap->udma_mask &= ATA_UDMA5;
ap->host->max_sectors = ATA_MAX_SECTORS;
ap->host->hostt->max_sectors = ATA_MAX_SECTORS;
ap->device[i].flags |= ATA_DFLAG_LOCK_SECTORS;
ap->device[i].max_sectors = ATA_MAX_SECTORS;
}
if (ap->ops->dev_config)