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 <[e-mail]>

drivers/char/agp/amd-k7-agp.c

···
 	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);

drivers/char/agp/ati-agp.c

···
 	temp = (temp & 0xfffff000);
 	ati_generic_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
 
+	if (!ati_generic_private.registers)
+		return -ENOMEM;
+
 	if (is_r200())
 		pci_write_config_dword(agp_bridge->dev, ATI_RS100_IG_AGPMODE, 0x20000);
 	else

drivers/char/agp/hp-agp.c

···
 	if (cap != PCI_CAP_ID_AGP) {
 		printk(KERN_ERR PFX "Invalid capability ID 0x%02x at 0x%x\n",
 		       cap, hp->lba_cap_offset);
+		iounmap(hp->lba_regs);
 		return -ENODEV;
 	}
 

drivers/char/agp/i460-agp.c

···
 	num_entries = A_SIZE_8(temp)->num_entries;
 
 	i460.gatt = ioremap(INTEL_I460_ATTBASE, PAGE_SIZE << page_order);
+	if (!i460.gatt) {
+		printk(KERN_ERR PFX "ioremap failed\n");
+		return -ENOMEM;
+	}
 
 	/* These are no good, the should be removed from the agp_bridge strucure... */
 	agp_bridge->gatt_table_real = NULL;

drivers/char/agp/intel-agp.c

···
 	temp &= 0xfff80000;
 
 	intel_private.registers = ioremap(temp,128 * 4096);
-	if (!intel_private.registers)
+	if (!intel_private.registers) {
+		iounmap(intel_private.gtt);
 		return -ENOMEM;
+	}
 
 	temp = readl(intel_private.registers+I810_PGETBL_CTL) & 0xfffff000;
 	global_cache_flush();	/* FIXME: ? */
···
        temp &= 0xfff00000;
        intel_private.gtt = ioremap((temp + (512 * 1024)) , 512 * 1024);
 
-       if (!intel_private.gtt)
-               return -ENOMEM;
+	if (!intel_private.gtt)
+		return -ENOMEM;
 
 
        intel_private.registers = ioremap(temp,128 * 4096);
-       if (!intel_private.registers)
-               return -ENOMEM;
+       if (!intel_private.registers) {
+		iounmap(intel_private.gtt);
+		return -ENOMEM;
+	}
 
        temp = readl(intel_private.registers+I810_PGETBL_CTL) & 0xfffff000;
        global_cache_flush();   /* FIXME: ? */

drivers/char/agp/nvidia-agp.c

···
 	nvidia_private.aperture =
 		(volatile u32 __iomem *) ioremap(apbase, 33 * PAGE_SIZE);
 
+	if (!nvidia_private.aperture)
+		return -ENOMEM;
+
 	return 0;
 }