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authorJens Axboe <jaxboe@fusionio.com>2011-05-20 20:33:15 +0200
committerJens Axboe <jaxboe@fusionio.com>2011-05-20 20:33:15 +0200
commit698567f3fa790fea37509a54dea855302dd88331 (patch)
tree7a1df976a0eb12cab03e82c18809a30d5482fee4 /arch/x86/kernel/pci-gart_64.c
parentd70d0711edd8076ec2ce0ed109106e2df950681b (diff)
parent61c4f2c81c61f73549928dfd9f3e8f26aa36a8cf (diff)
downloadlinux-698567f3fa790fea37509a54dea855302dd88331.tar.gz
Merge commit 'v2.6.39' into for-2.6.40/core
Since for-2.6.40/core was forked off the 2.6.39 devel tree, we've had churn in the core area that makes it difficult to handle patches for eg cfq or blk-throttle. Instead of requiring that they be based in older versions with bugs that have been fixed later in the rc cycle, merge in 2.6.39 final. Also fixes up conflicts in the below files. Conflicts: drivers/block/paride/pcd.c drivers/cdrom/viocd.c drivers/ide/ide-cd.c Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'arch/x86/kernel/pci-gart_64.c')
-rw-r--r--arch/x86/kernel/pci-gart_64.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 82ada01625b9..b117efd24f71 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -81,6 +81,9 @@ static u32 gart_unmapped_entry;
#define AGPEXTERN
#endif
+/* GART can only remap to physical addresses < 1TB */
+#define GART_MAX_PHYS_ADDR (1ULL << 40)
+
/* backdoor interface to AGP driver */
AGPEXTERN int agp_memory_reserved;
AGPEXTERN __u32 *agp_gatt_table;
@@ -212,9 +215,13 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem,
size_t size, int dir, unsigned long align_mask)
{
unsigned long npages = iommu_num_pages(phys_mem, size, PAGE_SIZE);
- unsigned long iommu_page = alloc_iommu(dev, npages, align_mask);
+ unsigned long iommu_page;
int i;
+ if (unlikely(phys_mem + size > GART_MAX_PHYS_ADDR))
+ return bad_dma_addr;
+
+ iommu_page = alloc_iommu(dev, npages, align_mask);
if (iommu_page == -1) {
if (!nonforced_iommu(dev, phys_mem, size))
return phys_mem;