sh: Bail out early on PCI resource conflicts.

Presently we just call in to request_resource() for the ioport and iomem
resources without checking for errors. This has already hidden a couple
of bugs, so add some error handling in for good measure.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 9 insertions, 13 deletions

diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 191075e91cda..82e59bc6210e 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -53,8 +53,12 @@ static DEFINE_MUTEX(pci_scan_mutex);
 
 void __devinit register_pci_controller(struct pci_channel *hose)
 {
-        request_resource(&iomem_resource, hose->mem_resource);
-        request_resource(&ioport_resource, hose->io_resource);
+        if (request_resource(&iomem_resource, hose->mem_resource) < 0)
+                goto out;
+        if (request_resource(&ioport_resource, hose->io_resource) < 0) {
+                release_resource(hose->mem_resource);
+                goto out;
+        }
 
         *hose_tail = hose;
         hose_tail = &hose->next;
@@ -76,6 +80,9 @@ void __devinit register_pci_controller(struct pci_channel *hose)
                 pcibios_scanbus(hose);
                 mutex_unlock(&pci_scan_mutex);
         }
+
+out:
+        printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
 }
 
 static int __init pcibios_init(void)
@@ -319,20 +326,9 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 
         if (flags & IORESOURCE_IO)
                 return ioport_map_pci(dev, start, len);
-
-        /*
-         * Presently the IORESOURCE_MEM case is a bit special, most
-         * SH7751 style PCI controllers have PCI memory at a fixed
-         * location in the address space where no remapping is desired.
-         * With the IORESOURCE_MEM case more care has to be taken
-         * to inhibit page table mapping for legacy cores, but this is
-         * punted off to __ioremap().
-         *                                      -- PFM.
-         */
         if (flags & IORESOURCE_MEM) {
                 if (flags & IORESOURCE_CACHEABLE)
                         return ioremap(start, len);
-
                 return ioremap_nocache(start, len);
         }