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authorCasey Dahlin <cdahlin@redhat.com>2009-08-21 03:27:56 +0400
committerIngo Molnar <mingo@elte.hu>2009-08-21 12:36:03 +0400
commitc7084b35eb1a4d3353a501508baf9d3d82822c93 (patch)
treecbb16e4f78f3195c71ade12918977fae9f96d520
parent451d7400a34cb679369e337d67f0238ed410f484 (diff)
downloadlinux-c7084b35eb1a4d3353a501508baf9d3d82822c93.tar.xz
lib/swiotlb.c: Fix strange panic message selection logic when swiotlb fills up
swiotlb_full() in lib/swiotlb.c throws one of two panic messages based on whether the direction of transfer is from the device or to the device. The logic around this is somewhat weird in the case of bidirectional transfers. It appears to want to throw both in succession, but since its a panic only the first makes it. This patch adds a third, separate error for DMA_BIDIRECTIONAL to make things a bit clearer. Signed-off-by: Casey Dahlin <cdahlin@redhat.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Becky Bruce <beckyb@kernel.crashing.org> [ further fixed the error message ] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <200908202327.n7KNRuqK001504@imap1.linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--lib/swiotlb.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 9e2fe3e1804c..ac25cd28e807 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -581,12 +581,15 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at "
"device %s\n", size, dev ? dev_name(dev) : "?");
- if (size > io_tlb_overflow && do_panic) {
- if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
- panic("DMA: Memory would be corrupted\n");
- if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
- panic("DMA: Random memory would be DMAed\n");
- }
+ if (size <= io_tlb_overflow || !do_panic)
+ return;
+
+ if (dir == DMA_BIDIRECTIONAL)
+ panic("DMA: Random memory could be DMA accessed\n");
+ if (dir == DMA_FROM_DEVICE)
+ panic("DMA: Random memory could be DMA written\n");
+ if (dir == DMA_TO_DEVICE)
+ panic("DMA: Random memory could be DMA read\n");
}
/*