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[SCSI] libsas: poll for ata device readiness after reset

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Use ata_wait_after_reset() to poll for link recovery after a reset.
This combined with sas_ha->eh_mutex prevents expander rediscovery from
probing phys in an intermediate state.  Local discovery does not have a
mechanism to filter link status changes during this timeout, so it
remains the responsibility of lldds to prevent premature port teardown.
Although once all lldd's support ->lldd_ata_check_ready() that could be
used as a gate to local port teardown.

The signature fis is re-transmitted when the link comes back so we
should be revalidating the ata device class, but that is left to a future
patch.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams
2011-11-17 17:59:54 -08:00
committed by James Bottomley
parent 50824d6c56
commit 36a3994739
4 changed files with 84 additions and 36 deletions
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10
drivers/scsi/libsas/sas_expander.c
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@@ -125,7 +125,11 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
task->task_status.stat == SAS_DATA_OVERRUN) {
res = -EMSGSIZE;
break;
} else {
}
if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
task->task_status.stat == SAS_DEVICE_UNKNOWN)
break;
else {
SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
"status 0x%x\n", __func__,
SAS_ADDR(dev->sas_addr),
@@ -1648,8 +1652,8 @@ static int sas_get_phy_change_count(struct domain_device *dev,
return res;
}
static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
int phy_id, u8 *attached_sas_addr)
int sas_get_phy_attached_sas_addr(struct domain_device *dev, int phy_id,
u8 *attached_sas_addr)
{
int res;
struct smp_resp *disc_resp;