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| author | Tejun Heo <htejun@gmail.com> | 2006-02-12 23:32:59 +0900 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2006-02-12 14:36:30 -0500 |
| commit | b00eec1d58ee71131375bfeb86e64bceec3f5618 (patch) | |
| tree | 03536ad3ecc61d42da0611f40a51fedcd44192b5 /drivers/scsi/libata-scsi.c | |
| parent | 6e7846e9c548443c86cfbad9e4defb4bdcfc538b (diff) | |
| download | linux-b00eec1d58ee71131375bfeb86e64bceec3f5618.tar.gz linux-b00eec1d58ee71131375bfeb86e64bceec3f5618.tar.bz2 linux-b00eec1d58ee71131375bfeb86e64bceec3f5618.zip | |
[PATCH] libata: add per-device max_sectors
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>
Diffstat (limited to 'drivers/scsi/libata-scsi.c')
| -rw-r--r-- | drivers/scsi/libata-scsi.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c index 3628fedc9865..86da46502b3e 100644 --- a/drivers/scsi/libata-scsi.c +++ b/drivers/scsi/libata-scsi.c @@ -684,23 +684,23 @@ int ata_scsi_slave_config(struct scsi_device *sdev) if (sdev->id < ATA_MAX_DEVICES) { struct ata_port *ap; struct ata_device *dev; + unsigned int max_sectors; ap = (struct ata_port *) &sdev->host->hostdata[0]; dev = &ap->device[sdev->id]; - /* TODO: 1024 is an arbitrary number, not the + /* TODO: 2048 is an arbitrary number, not the * hardware maximum. This should be increased to * 65534 when Jens Axboe's patch for dynamically * determining max_sectors is merged. */ - if ((dev->flags & ATA_DFLAG_LBA48) && - ((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) { - /* - * do not overwrite sdev->host->max_sectors, since - * other drives on this host may not support LBA48 - */ - blk_queue_max_sectors(sdev->request_queue, 2048); - } + max_sectors = ATA_MAX_SECTORS; + if (dev->flags & ATA_DFLAG_LBA48) + max_sectors = 2048; + if (dev->max_sectors) + max_sectors = dev->max_sectors; + + blk_queue_max_sectors(sdev->request_queue, max_sectors); /* * SATA DMA transfers must be multiples of 4 byte, so |