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authorBrian King <brking@us.ibm.com>2005-08-18 07:32:18 +1000
committerLinus Torvalds <torvalds@g5.osdl.org>2005-08-17 14:41:22 -0700
commitac9af7cba9e642961bfdee1a1fac6060405597e5 (patch)
tree5baf99a801a00137fefb158983c88180d36fa999 /arch/ppc64/kernel/iommu.c
parent75e8727fbb3749075b6df36be636a3045ed9d515 (diff)
[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>
Diffstat (limited to 'arch/ppc64/kernel/iommu.c')
-rw-r--r--arch/ppc64/kernel/iommu.c7
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;