[MTD][MTDPART] Fix a division by zero bug

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / pci-gart_64.c

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 700e4647dd30214ba33b90845f4121421515948d..aa8ec928caa85ff43d4da3a0fe3e7d570b57f08a 100644 (file)
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -26,6 +26,7 @@
 #include <linux/kdebug.h>
 #include <linux/scatterlist.h>
 #include <linux/iommu-helper.h>
+#include <linux/sysdev.h>
 #include <asm/atomic.h>
 #include <asm/io.h>
 #include <asm/mtrr.h>
@@ -264,9 +265,9 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem,
 }
 
 static dma_addr_t
-gart_map_simple(struct device *dev, char *buf, size_t size, int dir)
+gart_map_simple(struct device *dev, phys_addr_t paddr, size_t size, int dir)
 {
-       dma_addr_t map = dma_map_area(dev, virt_to_bus(buf), size, dir);
+       dma_addr_t map = dma_map_area(dev, paddr, size, dir);
 
        flush_gart();
 
@@ -275,18 +276,17 @@ gart_map_simple(struct device *dev, char *buf, size_t size, int dir)
 
 /* Map a single area into the IOMMU */
 static dma_addr_t
-gart_map_single(struct device *dev, void *addr, size_t size, int dir)
+gart_map_single(struct device *dev, phys_addr_t paddr, size_t size, int dir)
 {
-       unsigned long phys_mem, bus;
+       unsigned long bus;
 
        if (!dev)
                dev = &fallback_dev;
 
-       phys_mem = virt_to_phys(addr);
-       if (!need_iommu(dev, phys_mem, size))
-               return phys_mem;
+       if (!need_iommu(dev, paddr, size))
+               return paddr;
 
-       bus = gart_map_simple(dev, addr, size, dir);
+       bus = gart_map_simple(dev, paddr, size, dir);
 
        return bus;
 }
@@ -549,6 +549,28 @@ static __init unsigned read_aperture(struct pci_dev *dev, u32 *size)
        return aper_base;
 }
 
+static int gart_resume(struct sys_device *dev)
+{
+       return 0;
+}
+
+static int gart_suspend(struct sys_device *dev, pm_message_t state)
+{
+       return -EINVAL;
+}
+
+static struct sysdev_class gart_sysdev_class = {
+       .name = "gart",
+       .suspend = gart_suspend,
+       .resume = gart_resume,
+
+};
+
+static struct sys_device device_gart = {
+       .id     = 0,
+       .cls    = &gart_sysdev_class,
+};
+
 /*
  * Private Northbridge GATT initialization in case we cannot use the
  * AGP driver for some reason.
@@ -559,7 +581,7 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
        unsigned aper_base, new_aper_base;
        struct pci_dev *dev;
        void *gatt;
-       int i;
+       int i, error;
 
        printk(KERN_INFO "PCI-DMA: Disabling AGP.\n");
        aper_size = aper_base = info->aper_size = 0;
@@ -607,6 +629,12 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 
                pci_write_config_dword(dev, 0x90, ctl);
        }
+
+       error = sysdev_class_register(&gart_sysdev_class);
+       if (!error)
+               error = sysdev_register(&device_gart);
+       if (error)
+               panic("Could not register gart_sysdev -- would corrupt data on next suspend");
        flush_gart();
 
        printk(KERN_INFO "PCI-DMA: aperture base @ %x size %u KB\n",