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authorDan Williams <dan.j.williams@intel.com>2012-01-31 09:40:45 +0400
committerJames Bottomley <JBottomley@Parallels.com>2012-03-01 01:42:51 +0400
commit26a2e68f816ebd736a0484ca293457b280af4ef1 (patch)
tree5fbae208c3bcda21dd1f9f918e811e07c2ce80e8 /drivers/scsi/libsas
parent77c309f3cdf9e217032dfe330f5881d352bb0436 (diff)
downloadlinux-26a2e68f816ebd736a0484ca293457b280af4ef1.tar.xz
[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>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_ata.c5
-rw-r--r--drivers/scsi/libsas/sas_init.c3
-rw-r--r--drivers/scsi/libsas/sas_scsi_host.c3
3 files changed, 7 insertions, 4 deletions
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 08d2103a45b7..bc0cecc6ad62 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -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");
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 09c14ca3fbd5..120bff64be30 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -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
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index fd3291337c1b..f0b9b7bf1882 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -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));