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sata_nv: reinstate nv_hardreset() for non generic controllers 

Commit 2fd673ecf0 which tried to remove
hardreset for generic accidentally removed it for all flavors as all
others were inheriting from nv_generic_ops.  This patch reinstates
nv_hardreset() and puts it into nv_common_ops which all flavors
inherit from.  nv_generic_ops now inherits from nv_common_ops and
overrides .hardreset to ATA_OP_NULL.

While at it, explain why nv_hardreset and ATA_OP_NULL override are
necessary.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-09-28 07:39:01 +09:00 committed by Jeff Garzik
parent 6ef190cc92
commit 4c1eb90a09
1 changed files with 40 additions and 6 deletions
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46
drivers/ata/sata_nv.c
View File

@ -309,6 +309,8 @@ static void nv_nf2_freeze(struct ata_port *ap);
static void nv_nf2_thaw(struct ata_port *ap);
static void nv_ck804_freeze(struct ata_port *ap);
static void nv_ck804_thaw(struct ata_port *ap);
static int nv_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
static int nv_adma_slave_config(struct scsi_device *sdev);
static int nv_adma_check_atapi_dma(struct ata_queued_cmd *qc);
static void nv_adma_qc_prep(struct ata_queued_cmd *qc);
@ -403,28 +405,45 @@ static struct scsi_host_template nv_swncq_sht = {
.slave_configure = nv_swncq_slave_config,
};
static struct ata_port_operations nv_generic_ops = {
/* OSDL bz3352 reports that some nv controllers can't determine device
* signature reliably and nv_hardreset is implemented to work around
* the problem. This was reported on nf3 and it's unclear whether any
* other controllers are affected. However, the workaround has been
* applied to all variants and there isn't much to gain by trying to
* find out exactly which ones are affected at this point especially
* because NV has moved over to ahci for newer controllers.
*/
static struct ata_port_operations nv_common_ops = {
.inherits = &ata_bmdma_port_ops,
.hardreset = ATA_OP_NULL,
.hardreset = nv_hardreset,
.scr_read = nv_scr_read,
.scr_write = nv_scr_write,
};
/* OSDL bz11195 reports that link doesn't come online after hardreset
* on generic nv's and there have been several other similar reports
* on linux-ide. Disable hardreset for generic nv's.
*/
static struct ata_port_operations nv_generic_ops = {
.inherits = &nv_common_ops,
.hardreset = ATA_OP_NULL,
};
static struct ata_port_operations nv_nf2_ops = {
.inherits = &nv_generic_ops,
.inherits = &nv_common_ops,
.freeze = nv_nf2_freeze,
.thaw = nv_nf2_thaw,
};
static struct ata_port_operations nv_ck804_ops = {
.inherits = &nv_generic_ops,
.inherits = &nv_common_ops,
.freeze = nv_ck804_freeze,
.thaw = nv_ck804_thaw,
.host_stop = nv_ck804_host_stop,
};
static struct ata_port_operations nv_adma_ops = {
.inherits = &nv_generic_ops,
.inherits = &nv_common_ops,
.check_atapi_dma = nv_adma_check_atapi_dma,
.sff_tf_read = nv_adma_tf_read,
@ -448,7 +467,7 @@ static struct ata_port_operations nv_adma_ops = {
};
static struct ata_port_operations nv_swncq_ops = {
.inherits = &nv_generic_ops,
.inherits = &nv_common_ops,
.qc_defer = ata_std_qc_defer,
.qc_prep = nv_swncq_qc_prep,
@ -1586,6 +1605,21 @@ static void nv_mcp55_thaw(struct ata_port *ap)
ata_sff_thaw(ap);
}
static int nv_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
int rc;
/* SATA hardreset fails to retrieve proper device signature on
* some controllers. Request follow up SRST. For more info,
* see http://bugzilla.kernel.org/show_bug.cgi?id=3352
*/
rc = sata_sff_hardreset(link, class, deadline);
if (rc)
return rc;
return -EAGAIN;
}
static void nv_adma_error_handler(struct ata_port *ap)
{
struct nv_adma_port_priv *pp = ap->private_data;