net: emaclite: add barriers to support Xilinx Zynq platform

This patch adds barriers at appropriate places to ensure the driver
works on Xilinx Zynq ARM-based SoC platform.

Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index b2850fdb517e..fefb8cd5eb65 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -220,6 +220,13 @@ static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr,
                 *to_u16_ptr++ = *from_u16_ptr++;
                 *to_u16_ptr++ = *from_u16_ptr++;
 
+                /* This barrier resolves occasional issues seen around
+                 * cases where the data is not properly flushed out
+                 * from the processor store buffers to the destination
+                 * memory locations.
+                 */
+                wmb();
+
                 /* Output a word */
                 *to_u32_ptr++ = align_buffer;
         }
@@ -235,6 +242,12 @@ static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr,
                 for (; length > 0; length--)
                         *to_u8_ptr++ = *from_u8_ptr++;
 
+                /* This barrier resolves occasional issues seen around
+                 * cases where the data is not properly flushed out
+                 * from the processor store buffers to the destination
+                 * memory locations.
+                 */
+                wmb();
                 *to_u32_ptr = align_buffer;
         }
 }