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[SCSI] libsas: don't recover end devices attached to disabled phys 

If userspace has decided to disable a phy the kernel should honor that
and not inadvertantly re-enable the phy via error recovery.  This is
more straightforward in the sata case where link recovery (via
libata-eh) is separate from sas_task cancelling in libsas-eh.  Teach
libsas to accept -ENODEV as a successful response from I_T_nexus_reset
('successful' in terms of not escalating further).

This is a more comprehensive fix then "libsas: don't recover 'gone'
devices in sas_ata_hard_reset()", as it is no longer sata-specific.

aic94xx does check the return value from sas_phy_reset() so if the phy
is disabled we proceed with clearing the I_T_nexus.

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 2012-01-30 21:40:45 -08:00 committed by James Bottomley
parent 77c309f3cd
commit 26a2e68f81
4 changed files with 8 additions and 5 deletions
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2
drivers/scsi/aic94xx/aic94xx_tmf.c
View File

@ -192,7 +192,7 @@ int asd_I_T_nexus_reset(struct domain_device *dev)
ASD_DPRINTK("sending %s reset to %s\n",
reset_type ? "hard" : "soft", dev_name(&phy->dev));
res = sas_phy_reset(phy, reset_type);
if (res == TMF_RESP_FUNC_COMPLETE) {
if (res == TMF_RESP_FUNC_COMPLETE || res == -ENODEV) {
/* wait for the maximum settle time */
msleep(500);
/* clear all outstanding commands (keep nexus suspended) */

5
drivers/scsi/libsas/sas_ata.c
View File

@ -407,10 +407,9 @@ static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
struct domain_device *dev = ap->private_data;
struct sas_internal *i = dev_to_sas_internal(dev);
if (test_bit(SAS_DEV_GONE, &dev->state))
return -ENODEV;
res = i->dft->lldd_I_T_nexus_reset(dev);
if (res == -ENODEV)
return res;
if (res != TMF_RESP_FUNC_COMPLETE)
sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");

3
drivers/scsi/libsas/sas_init.c
View File

@ -298,6 +298,9 @@ int sas_phy_reset(struct sas_phy *phy, int hard_reset)
int ret;
enum phy_func reset_type;
if (!phy->enabled)
return -ENODEV;
if (hard_reset)
reset_type = PHY_FUNC_HARD_RESET;
else

3
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -607,7 +607,8 @@ static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *
SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
task);
tmf_resp = sas_recover_I_T(task->dev);
if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
tmf_resp == -ENODEV) {
struct domain_device *dev = task->dev;
SAS_DPRINTK("I_T %016llx recovered\n",
SAS_ADDR(task->dev->sas_addr));