[SCSI] mpt2sas: driver fails to recover from injected PCIe bus errors

fixes surrounding PCIe enhanced error handling:

(1) We need to reject all request generated internaly inside the driver as well
as request arriving from the scsi mid layer when PCIe EEH is active. The fix is
to add a per adapter flag called pci_error_recovery which is checked thru out
the driver when request are generated.

(2) We don't need to call the pci_driver->remove directly from the PCIe
callbacks becuase its already called from the PCIe EEH code. In its place we are
shutting down the watchdog timer, and flushing back all pending IO.

(3) We need to save and restore the pci state across PCIe EEH handling.

Signed-off-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index f29ea5e78bb3..b55c6dc07470 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -140,7 +140,7 @@ _transport_set_identify(struct MPT2SAS_ADAPTER *ioc, u16 handle,
         u32 device_info;
         u32 ioc_status;
 
-        if (ioc->shost_recovery) {
+        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                 printk(MPT2SAS_INFO_FMT "%s: host reset in progress!\n",
                     __func__, ioc->name);
                 return -EFAULT;
@@ -302,7 +302,7 @@ _transport_expander_report_manufacture(struct MPT2SAS_ADAPTER *ioc,
         u64 *sas_address_le;
         u16 wait_state_count;
 
-        if (ioc->shost_recovery) {
+        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                 printk(MPT2SAS_INFO_FMT "%s: host reset in progress!\n",
                     __func__, ioc->name);
                 return -EFAULT;
@@ -894,7 +894,7 @@ mpt2sas_transport_update_links(struct MPT2SAS_ADAPTER *ioc,
         struct _sas_node *sas_node;
         struct _sas_phy *mpt2sas_phy;
 
-        if (ioc->shost_recovery)
+        if (ioc->shost_recovery || ioc->pci_error_recovery)
                 return;
 
         spin_lock_irqsave(&ioc->sas_node_lock, flags);
@@ -997,7 +997,7 @@ _transport_get_expander_phy_error_log(struct MPT2SAS_ADAPTER *ioc,
         u64 *sas_address_le;
         u16 wait_state_count;
 
-        if (ioc->shost_recovery) {
+        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                 printk(MPT2SAS_INFO_FMT "%s: host reset in progress!\n",
                     __func__, ioc->name);
                 return -EFAULT;