[patch 012/101] Missing critical phys_to_virt in lib/swiotlb.c

[Greg KH]

From: David Moore <dcm@xxxxxxx>

Missing critical phys_to_virt in lib/swiotlb.c

Adds missing call to phys_to_virt() in the
lib/swiotlb.c:swiotlb_sync_sg() function.  Without this change, a kernel
panic will always occur whenever a SWIOTLB bounce buffer from a
scatter-gather list gets synced.  Affected are especially Intel x86_64
machines with more than about 3 GB RAM.

Signed-off-by: David Moore <dcm@xxxxxxx>
Signed-off-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 lib/swiotlb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.20.1.orig/lib/swiotlb.c
+++ linux-2.6.20.1/lib/swiotlb.c
@@ -750,7 +750,7 @@ swiotlb_sync_sg(struct device *hwdev, st
 
 	for (i = 0; i < nelems; i++, sg++)
 		if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
-			sync_single(hwdev, (void *) sg->dma_address,
+			sync_single(hwdev, phys_to_virt(sg->dma_address),
 				    sg->dma_length, dir, target);
 }
 

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