[SCSI] Bug 4940 Repeatable Kernel Panic on Adaptec 2015S I20 device on bootup

From: "Salyzyn, Mark" <mark_salyzyn@adaptec.com>

Prevent driver from loading if another driver (i2o) has already claimed
the resources associated with the card. Discussion associated with this
bug can be referenced at http://bugzilla.kernel.org/show_bug.cgi?id=4940
where it was agreed to use pci_request_regions in both the dpt_i2o and
the i2o driver to prevent both drivers loading on the same adapter(s).

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>

Rejections fixed up and

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index e2370529c632..bc7b84c95db6 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -907,9 +907,13 @@ static int adpt_install_hba(struct scsi_host_template* sht, struct pci_dev* pDev
                 raptorFlag = TRUE;
         }
 
-
+        if (pci_request_regions(pDev)) {
+                PERROR("dpti: adpt_config_hba: pci request region failed\n");
+                return -EINVAL;
+        }
         base_addr_virt = ioremap(base_addr0_phys,hba_map0_area_size);
         if (!base_addr_virt) {
+                pci_release_regions(pDev);
                 PERROR("dpti: adpt_config_hba: io remap failed\n");
                 return -EINVAL;
         }
@@ -919,6 +923,7 @@ static int adpt_install_hba(struct scsi_host_template* sht, struct pci_dev* pDev
                 if (!msg_addr_virt) {
                         PERROR("dpti: adpt_config_hba: io remap failed on BAR1\n");
                         iounmap(base_addr_virt);
+                        pci_release_regions(pDev);
                         return -EINVAL;
                 }
         } else {
@@ -932,6 +937,7 @@ static int adpt_install_hba(struct scsi_host_template* sht, struct pci_dev* pDev
                         iounmap(msg_addr_virt);
                 }
                 iounmap(base_addr_virt);
+                pci_release_regions(pDev);
                 return -ENOMEM;
         }
         memset(pHba, 0, sizeof(adpt_hba));
@@ -1027,6 +1033,7 @@ static void adpt_i2o_delete_hba(adpt_hba* pHba)
         up(&adpt_configuration_lock);
 
         iounmap(pHba->base_addr_virt);
+        pci_release_regions(pHba->pDev);
         if(pHba->msg_addr_virt != pHba->base_addr_virt){
                 iounmap(pHba->msg_addr_virt);
         }