DMA_ATTR_SKIP_CPU_SYNC was added to the enum with kernel 3.6. This
patch removes all calls to dma_set_attr() with this value on
kernel < 3.6.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
.../media/0005-dma-no-sync/v4l2.patch | 64 ++++++++++++++++++++++
1 file changed, 64 insertions(+)
create mode 100644 patches/collateral-evolutions/media/0005-dma-no-sync/v4l2.patch
diff --git a/patches/collateral-evolutions/media/0005-dma-no-sync/v4l2.patch b/patches/collateral-evolutions/media/0005-dma-no-sync/v4l2.patch
new file mode 100644
index 0000000..bdb2ff3
--- /dev/null
+++ b/patches/collateral-evolutions/media/0005-dma-no-sync/v4l2.patch
@@ -0,0 +1,64 @@
+--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
++++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
+@@ -564,7 +564,9 @@ static void vb2_dc_put_userptr(void *buf
+ if (sgt) {
+ DEFINE_DMA_ATTRS(attrs);
+
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
++#endif
+ /*
+ * No need to sync to CPU, it's already synced to the CPU
+ * since the finish() memop will have been called before this.
+@@ -629,7 +631,9 @@ static void *vb2_dc_get_userptr(void *al
+ unsigned long dma_align = dma_get_cache_alignment();
+ DEFINE_DMA_ATTRS(attrs);
+
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
++#endif
+
+ /* Only cache aligned DMA transfers are reliable */
+ if (!IS_ALIGNED(vaddr | size, dma_align)) {
+--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
++++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
+@@ -109,7 +109,9 @@ static void *vb2_dma_sg_alloc(void *allo
+ int num_pages;
+ DEFINE_DMA_ATTRS(attrs);
+
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
++#endif
+
+ if (WARN_ON(alloc_ctx == NULL))
+ return NULL;
+@@ -184,7 +186,9 @@ static void vb2_dma_sg_put(void *buf_pri
+ if (atomic_dec_and_test(&buf->refcount)) {
+ DEFINE_DMA_ATTRS(attrs);
+
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
++#endif
+ dprintk(1, "%s: Freeing buffer of %d pages\n", __func__,
+ buf->num_pages);
+ dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->nents,
+@@ -241,7 +245,9 @@ static void *vb2_dma_sg_get_userptr(void
+ struct sg_table *sgt;
+ DEFINE_DMA_ATTRS(attrs);
+
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
++#endif
+
+ buf = kzalloc(sizeof *buf, GFP_KERNEL);
+ if (!buf)
+@@ -347,7 +353,9 @@ static void vb2_dma_sg_put_userptr(void
+ int i = buf->num_pages;
+ DEFINE_DMA_ATTRS(attrs);
+
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
++#endif
+
+ dprintk(1, "%s: Releasing userspace buffer of %d pages\n",
+ __func__, buf->num_pages);
--
1.9.1
--
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