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authorDavid S. Miller <davem@sunset.davemloft.net>2007-10-17 04:08:48 -0700
committerJens Axboe <jens.axboe@oracle.com>2007-10-17 13:11:59 +0200
commit5804509e652fd26227f6da732d5445af444730d3 (patch)
tree2d518870a85913d0a3483eecadbc07be85e9a2cf /arch/sparc64/kernel/pci_sun4v.c
parent60573b874b03d22678614ca1e73f6b15c1b53b40 (diff)
Fix loop terminating conditions in fill_sg().
Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'arch/sparc64/kernel/pci_sun4v.c')
-rw-r--r--arch/sparc64/kernel/pci_sun4v.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 119f8efa03d..fe46ace3e59 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -368,12 +368,11 @@ static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
#define SG_ENT_PHYS_ADDRESS(SG) \
(__pa(page_address((SG)->page)) + (SG)->offset)
-static inline long fill_sg(long entry, struct device *dev,
- struct scatterlist *sg,
- int nused, int nelems, unsigned long prot)
+static long fill_sg(long entry, struct device *dev,
+ struct scatterlist *sg,
+ int nused, int nelems, unsigned long prot)
{
struct scatterlist *dma_sg = sg;
- struct scatterlist *sg_end = sg_last(sg, nelems);
unsigned long flags;
int i;
@@ -414,6 +413,7 @@ static inline long fill_sg(long entry, struct device *dev,
break;
}
sg = sg_next(sg);
+ nelems--;
}
pteval = (pteval & IOPTE_PAGE);
@@ -432,19 +432,20 @@ static inline long fill_sg(long entry, struct device *dev,
pteval = (pteval & IOPTE_PAGE) + len;
sg = sg_next(sg);
+ nelems--;
/* Skip over any tail mappings we've fully mapped,
* adjusting pteval along the way. Stop when we
* detect a page crossing event.
*/
- while ((pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
+ while (nelems &&
+ (pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
(pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
((pteval ^
(SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
pteval += sg->length;
- if (sg == sg_end)
- break;
sg = sg_next(sg);
+ nelems--;
}
if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
pteval = ~0UL;