[SCSI] sym53c8xx: handle pci_iomap() failures

sym_init_device() doesn't check if pci_iomap() fails.  It also tries
to map device RAM without first checking FE_RAM.

1) Move some initialization from sym_init_device() to the top of
   sym2_probe().
2) Rename sym_init_device() to sym_iomap_device().
3) Call sym_iomap_device() after sym_check_supported() instead of
   before so that device->chip.features will be set.
4) Check FE_RAM in sym_iomap_device() before mapping RAM.
5) If sym_iomap_device() cannot map registers, then abort.
6) If sym_iomap_device() cannot map RAM, then fall back to not using
   RAM and continue.
7) Remove the check for FE_RAM in sym_attach() since dev->ram_base
   is now always set correctly.

Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 36 insertions, 26 deletions

diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index 8e69b5c35f58..a0d5aa6aad79 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -1236,7 +1236,7 @@ static int sym53c8xx_proc_info(struct Scsi_Host *shost, char *buffer,
 #endif /* SYM_LINUX_PROC_INFO_SUPPORT */
 
 /*
- * Free resources claimed by sym_init_device().  Note that
+ * Free resources claimed by sym_iomap_device().  Note that
  * sym_free_resources() should be used instead of this function after calling
  * sym_attach().
  */
@@ -1336,12 +1336,9 @@ static struct Scsi_Host * __devinit sym_attach(struct scsi_host_template *tpnt,
         np->maxburst    = dev->chip.burst_max;
         np->myaddr      = dev->host_id;
         np->mmio_ba     = (u32)dev->mmio_base;
+        np->ram_ba      = (u32)dev->ram_base;
         np->s.ioaddr    = dev->s.ioaddr;
         np->s.ramaddr   = dev->s.ramaddr;
-        if (!(np->features & FE_RAM))
-                dev->ram_base = 0;
-        if (dev->ram_base)
-                np->ram_ba = (u32)dev->ram_base;
 
         /*
          *  Edit its name.
@@ -1559,30 +1556,28 @@ static int __devinit sym_set_workarounds(struct sym_device *device)
 }
 
 /*
- *  Read and check the PCI configuration for any detected NCR 
- *  boards and save data for attaching after all boards have 
- *  been detected.
+ * Map HBA registers and on-chip SRAM (if present).
  */
-static void __devinit
-sym_init_device(struct pci_dev *pdev, struct sym_device *device)
+static int __devinit
+sym_iomap_device(struct sym_device *device)
 {
-        int i = 2;
+        struct pci_dev *pdev = device->pdev;
         struct pci_bus_region bus_addr;
-
-        device->host_id = SYM_SETUP_HOST_ID;
-        device->pdev = pdev;
+        int i = 2;
 
         pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[1]);
         device->mmio_base = bus_addr.start;
 
-        /*
-         * If the BAR is 64-bit, resource 2 will be occupied by the
-         * upper 32 bits
-         */
-        if (!pdev->resource[i].flags)
-                i++;
-        pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[i]);
-        device->ram_base = bus_addr.start;
+        if (device->chip.features & FE_RAM) {
+                /*
+                 * If the BAR is 64-bit, resource 2 will be occupied by the
+                 * upper 32 bits
+                 */
+                if (!pdev->resource[i].flags)
+                        i++;
+                pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[i]);
+                device->ram_base = bus_addr.start;
+        }
 
 #ifdef CONFIG_SCSI_SYM53C8XX_MMIO
         if (device->mmio_base)
@@ -1592,9 +1587,21 @@ sym_init_device(struct pci_dev *pdev, struct sym_device *device)
         if (!device->s.ioaddr)
                 device->s.ioaddr = pci_iomap(pdev, 0,
                                                 pci_resource_len(pdev, 0));
-        if (device->ram_base)
+        if (!device->s.ioaddr) {
+                dev_err(&pdev->dev, "could not map registers; giving up.\n");
+                return -EIO;
+        }
+        if (device->ram_base) {
                 device->s.ramaddr = pci_iomap(pdev, i,
                                                 pci_resource_len(pdev, i));
+                if (!device->s.ramaddr) {
+                        dev_warn(&pdev->dev,
+                                "could not map SRAM; continuing anyway.\n");
+                        device->ram_base = 0;
+                }
+        }
+
+        return 0;
 }
 
 /*
@@ -1711,6 +1718,8 @@ static int __devinit sym2_probe(struct pci_dev *pdev,
 
         memset(&sym_dev, 0, sizeof(sym_dev));
         memset(&nvram, 0, sizeof(nvram));
+        sym_dev.pdev = pdev;
+        sym_dev.host_id = SYM_SETUP_HOST_ID;
 
         if (pci_enable_device(pdev))
                 goto leave;
@@ -1720,12 +1729,13 @@ static int __devinit sym2_probe(struct pci_dev *pdev,
         if (pci_request_regions(pdev, NAME53C8XX))
                 goto disable;
 
-        sym_init_device(pdev, &sym_dev);
-        do_iounmap = 1;
-
         if (sym_check_supported(&sym_dev))
                 goto free;
 
+        if (sym_iomap_device(&sym_dev))
+                goto free;
+        do_iounmap = 1;
+
         if (sym_check_raid(&sym_dev)) {
                 do_disable_device = 0;  /* Don't disable the device */
                 goto free;