[SCSI] mpt3sas: fix cleanup on controller resource mapping failure

If mpt3sas_base_map_resources takes an early error path then its
counterpart, mpt3sas_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>

1 files changed, 17 insertions, 10 deletions

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 5dc280c75325..34ff896a140d 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -1709,8 +1709,6 @@ _base_enable_msix(struct MPT3SAS_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;
 
@@ -1790,6 +1788,7 @@ mpt3sas_base_map_resources(struct MPT3SAS_ADAPTER *ioc)
 	if (pci_enable_device_mem(pdev)) {
 		pr_warn(MPT3SAS_FMT "pci_enable_device_mem: failed\n",
 			ioc->name);
+		ioc->bars = 0;
 		return -ENODEV;
 	}
 
@@ -1798,6 +1797,7 @@ mpt3sas_base_map_resources(struct MPT3SAS_ADAPTER *ioc)
 	    MPT3SAS_DRIVER_NAME)) {
 		pr_warn(MPT3SAS_FMT "pci_request_selected_regions: failed\n",
 			ioc->name);
+		ioc->bars = 0;
 		r = -ENODEV;
 		goto out_fail;
 	}
@@ -4393,18 +4393,25 @@ mpt3sas_base_free_resources(struct MPT3SAS_ADAPTER *ioc)
 	dexitprintk(ioc, pr_info(MPT3SAS_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;
 }