agp: balance ioremap checks

patchset against 2.6.23-rc3.
corrects missing ioremap return checks and balancing on iounmap calls, integrated changes per list
recommendations on the original set of patches..

Signed-off-by: Scott Thompson <postfail <at> hushmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/char/agp/amd-k7-agp.c b/drivers/char/agp/amd-k7-agp.c
index df0ddf14b85c..f60bca70d1fb 100644
--- a/drivers/char/agp/amd-k7-agp.c
+++ b/drivers/char/agp/amd-k7-agp.c
@@ -223,6 +223,8 @@ static int amd_irongate_configure(void)
         pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
         temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
         amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
+        if (!amd_irongate_private.registers)
+                return -ENOMEM;
 
         /* Write out the address of the gatt table */
         writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);