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| author | Brian King <brking@us.ibm.com> | 2005-08-18 07:32:18 +1000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-08-17 14:41:22 -0700 |
| commit | ac9af7cba9e642961bfdee1a1fac6060405597e5 (patch) | |
| tree | 5baf99a801a00137fefb158983c88180d36fa999 | |
| parent | 75e8727fbb3749075b6df36be636a3045ed9d515 (diff) | |
| download | linux-3.10-ac9af7cba9e642961bfdee1a1fac6060405597e5.tar.gz linux-3.10-ac9af7cba9e642961bfdee1a1fac6060405597e5.tar.bz2 linux-3.10-ac9af7cba9e642961bfdee1a1fac6060405597e5.zip | |
[PATCH] ppc64: iommu vmerge fix
This fixes a bug in the PPC64 iommu vmerge code which results in the
potential for iommu_unmap_sg to go off unmapping more than it should.
This was found on a test system which resulted in PCI bus errors due to
PCI memory being unmapped while DMAs were still in progress.
Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/ppc64/kernel/iommu.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/ppc64/kernel/iommu.c b/arch/ppc64/kernel/iommu.c index 8316426ccaf..845eebd1e28 100644 --- a/arch/ppc64/kernel/iommu.c +++ b/arch/ppc64/kernel/iommu.c @@ -242,7 +242,7 @@ int iommu_map_sg(struct device *dev, struct iommu_table *tbl, dma_addr_t dma_next = 0, dma_addr; unsigned long flags; struct scatterlist *s, *outs, *segstart; - int outcount; + int outcount, incount; unsigned long handle; BUG_ON(direction == DMA_NONE); @@ -252,6 +252,7 @@ int iommu_map_sg(struct device *dev, struct iommu_table *tbl, outs = s = segstart = &sglist[0]; outcount = 1; + incount = nelems; handle = 0; /* Init first segment length for backout at failure */ @@ -338,10 +339,10 @@ int iommu_map_sg(struct device *dev, struct iommu_table *tbl, DBG("mapped %d elements:\n", outcount); - /* For the sake of iommu_free_sg, we clear out the length in the + /* For the sake of iommu_unmap_sg, we clear out the length in the * next entry of the sglist if we didn't fill the list completely */ - if (outcount < nelems) { + if (outcount < incount) { outs++; outs->dma_address = DMA_ERROR_CODE; outs->dma_length = 0; |