[SCSI] mpt2sas: fix cleanup on controller resource mapping failure

If mpt2sas_base_map_resources takes an early error path then its
counterpart, mpt2sas_base_free_resources needs to be careful about
cleaning up:

  1 - _base_mask_interrupts and _base_make_ioc_ready require memory
      mapped I/O registers, make sure that this is true.

  2 - _base_free_irq iterates over the adapter's reply_queue_list, so
      move this list head initialization out of _base_enable_msix to
      _scsih_probe so this will always be safe.

  3 - check that the controller PCI device and its BARs have been
      enabled before disabling them.

Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Acked-by: Sreekanth Reddy <Sreekanth.Reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 18 insertions, 10 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index ccd6d5a97ec3..cf131a3de61c 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1409,8 +1409,6 @@ _base_enable_msix(struct MPT2SAS_ADAPTER *ioc)
         int i;
         u8 try_msix = 0;
 
-        INIT_LIST_HEAD(&ioc->reply_queue_list);
-
         if (msix_disable == -1 || msix_disable == 0)
                 try_msix = 1;
 
@@ -1489,6 +1487,7 @@ mpt2sas_base_map_resources(struct MPT2SAS_ADAPTER *ioc)
         if (pci_enable_device_mem(pdev)) {
                 printk(MPT2SAS_WARN_FMT "pci_enable_device_mem: "
                     "failed\n", ioc->name);
+                ioc->bars = 0;
                 return -ENODEV;
         }
 
@@ -1497,6 +1496,7 @@ mpt2sas_base_map_resources(struct MPT2SAS_ADAPTER *ioc)
             MPT2SAS_DRIVER_NAME)) {
                 printk(MPT2SAS_WARN_FMT "pci_request_selected_regions: "
                     "failed\n", ioc->name);
+                ioc->bars = 0;
                 r = -ENODEV;
                 goto out_fail;
         }
@@ -4229,18 +4229,25 @@ mpt2sas_base_free_resources(struct MPT2SAS_ADAPTER *ioc)
         dexitprintk(ioc, printk(MPT2SAS_INFO_FMT "%s\n", ioc->name,
             __func__));
 
-        _base_mask_interrupts(ioc);
-        ioc->shost_recovery = 1;
-        _base_make_ioc_ready(ioc, CAN_SLEEP, SOFT_RESET);
-        ioc->shost_recovery = 0;
+        if (ioc->chip_phys && ioc->chip) {
+                _base_mask_interrupts(ioc);
+                ioc->shost_recovery = 1;
+                _base_make_ioc_ready(ioc, CAN_SLEEP, SOFT_RESET);
+                ioc->shost_recovery = 0;
+        }
+
         _base_free_irq(ioc);
         _base_disable_msix(ioc);
-        if (ioc->chip_phys)
+
+        if (ioc->chip_phys && ioc->chip)
                 iounmap(ioc->chip);
         ioc->chip_phys = 0;
-        pci_release_selected_regions(ioc->pdev, ioc->bars);
-        pci_disable_pcie_error_reporting(pdev);
-        pci_disable_device(pdev);
+
+        if (pci_is_enabled(pdev)) {
+                pci_release_selected_regions(ioc->pdev, ioc->bars);
+                pci_disable_pcie_error_reporting(pdev);
+                pci_disable_device(pdev);
+        }
         return;
 }
 
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 51004768d0f5..389d79290861 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -8175,6 +8175,7 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         INIT_LIST_HEAD(&ioc->sas_hba.sas_port_list);
         INIT_LIST_HEAD(&ioc->delayed_tr_list);
         INIT_LIST_HEAD(&ioc->delayed_tr_volume_list);
+        INIT_LIST_HEAD(&ioc->reply_queue_list);
 
         /* init shost parameters */
         shost->max_cmd_len = 32;