diff mbox

[v4,4/7] xen/arm: use is_dma_coherent

Message ID 1412941908-5850-4-git-send-email-stefano.stabellini@eu.citrix.com (mailing list archive)
State New, archived
Headers show

Commit Message

Stefano Stabellini Oct. 10, 2014, 11:51 a.m. UTC 
Use is_dma_coherent to check whether we need to issue cache maintenance
operations rather than checking on the existence of a particular
dma_ops function for the device.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/arm/xen/mm32.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Ian Campbell Oct. 20, 2014, 3:18 p.m. UTC | #1 
On Fri, 2014-10-10 at 12:51 +0100, Stefano Stabellini wrote:
> Use is_dma_coherent to check whether we need to issue cache maintenance
> operations rather than checking on the existence of a particular
> dma_ops function for the device.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Acked-by: Ian Campbell <ian.campbell@citrix.com>
diff mbox

Patch

diff --git a/arch/arm/xen/mm32.c b/arch/arm/xen/mm32.c
index 6153d61..c7fa673 100644
--- a/arch/arm/xen/mm32.c
+++ b/arch/arm/xen/mm32.c
@@ -76,7 +76,7 @@  void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
 		struct dma_attrs *attrs)
 
 {
-	if (!__generic_dma_ops(hwdev)->unmap_page)
+	if (is_dma_coherent(hwdev))
 		return;
 	if (dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
 		return;
@@ -87,7 +87,7 @@  void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
 void xen_dma_sync_single_for_cpu(struct device *hwdev,
 		dma_addr_t handle, size_t size, enum dma_data_direction dir)
 {
-	if (!__generic_dma_ops(hwdev)->sync_single_for_cpu)
+	if (is_dma_coherent(hwdev))
 		return;
 	__xen_dma_page_dev_to_cpu(hwdev, handle, size, dir);
 }
@@ -95,7 +95,7 @@  void xen_dma_sync_single_for_cpu(struct device *hwdev,
 void xen_dma_sync_single_for_device(struct device *hwdev,
 		dma_addr_t handle, size_t size, enum dma_data_direction dir)
 {
-	if (!__generic_dma_ops(hwdev)->sync_single_for_device)
+	if (is_dma_coherent(hwdev))
 		return;
 	__xen_dma_page_cpu_to_dev(hwdev, handle, size, dir);
 }