[Xen-changelog] Relax the bounce-buffer copying constraints in dma_sync_single_for_*

[Xen patchbot -2.0-testing <patchbot-2.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID a92c728c2812fd2756725fbfd45b5faa558af455
# Parent  b8347bea93247d0a15abb7000507ac3e6ef69a5f

Relax the bounce-buffer copying constraints in dma_sync_single_for_*
functions. This fixes certain drivers (e.g., ivtv).
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r b8347bea9324 -r a92c728c2812 
linux-2.6.11-xen-sparse/arch/xen/i386/kernel/pci-dma.c
--- a/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/pci-dma.c    Fri Jul 15 
07:58:10 2005
+++ b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/pci-dma.c    Fri Jul 15 
12:49:50 2005
@@ -327,7 +327,7 @@
                if (&ent->list != &dma_map_head) {
                        off = dma_handle - ent->dma;
                        BUG_ON((off + size) > ent->size);
-                       if (direction != DMA_TO_DEVICE)
+                       /*if (direction != DMA_TO_DEVICE)*/
                                memcpy(ent->host+off, ent->bounce+off, size);
                }
        }
@@ -351,7 +351,7 @@
                if (&ent->list != &dma_map_head) {
                        off = dma_handle - ent->dma;
                        BUG_ON((off + size) > ent->size);
-                       if (direction != DMA_FROM_DEVICE)
+                       /*if (direction != DMA_FROM_DEVICE)*/
                                memcpy(ent->bounce+off, ent->host+off, size);
                }
        }

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