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authorJan Beulich <JBeulich@novell.com>2009-12-15 19:47:43 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 10:20:12 -0500
commitac2b3e67dd59b8c6ef8c199641444c6ea03535a6 (patch)
treece7ac263fc47517ed42a15670a5359094b2a1f05 /lib
parentbbead2104e912571c3afb2aafe5ece1b446b56d9 (diff)
dma-mapping: fix off-by-one error in dma_capable()
dma_mask is, when interpreted as address, the last valid byte, and hence comparison msut also be done using the last valid of the buffer in question. Also fix the open-coded instances in lib/swiotlb.c. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Becky Bruce <beckyb@kernel.crashing.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/swiotlb.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 5bc01803f8f..437eedb5a53 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -549,7 +549,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
549 dma_mask = hwdev->coherent_dma_mask; 549 dma_mask = hwdev->coherent_dma_mask;
550 550
551 ret = (void *)__get_free_pages(flags, order); 551 ret = (void *)__get_free_pages(flags, order);
552 if (ret && swiotlb_virt_to_bus(hwdev, ret) + size > dma_mask) { 552 if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) {
553 /* 553 /*
554 * The allocated memory isn't reachable by the device. 554 * The allocated memory isn't reachable by the device.
555 */ 555 */
@@ -571,7 +571,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
571 dev_addr = swiotlb_virt_to_bus(hwdev, ret); 571 dev_addr = swiotlb_virt_to_bus(hwdev, ret);
572 572
573 /* Confirm address can be DMA'd by device */ 573 /* Confirm address can be DMA'd by device */
574 if (dev_addr + size > dma_mask) { 574 if (dev_addr + size - 1 > dma_mask) {
575 printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n", 575 printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
576 (unsigned long long)dma_mask, 576 (unsigned long long)dma_mask,
577 (unsigned long long)dev_addr); 577 (unsigned long long)dev_addr);