[Qemu-devel] [PATCH v1 1/1] etraxfs_dma: Dont forward zero-length payload to clients

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 hw/dma/etraxfs_dma.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/hw/dma/etraxfs_dma.c b/hw/dma/etraxfs_dma.c
index 9cbb165..d5650eb 100644
--- a/hw/dma/etraxfs_dma.c
+++ b/hw/dma/etraxfs_dma.c
@@ -440,13 +440,16 @@ static int channel_out_run(struct fs_dma_ctrl *ctrl, int c)
 		D(printf("channel %d pushes %x %u bytes eop=%u\n", c,
 		         saved_data_buf, len, out_eop));
 
-		if (ctrl->channels[c].client->client.push)
-			ctrl->channels[c].client->client.push(
-				ctrl->channels[c].client->client.opaque,
-				buf, len, out_eop);
-		else
+		if (ctrl->channels[c].client->client.push) {
+                        if (len > 0) {
+				ctrl->channels[c].client->client.push(
+					ctrl->channels[c].client->client.opaque,
+					buf, len, out_eop);
+			}
+		} else {
 			printf("WARNING: DMA ch%d dataloss,"
 			       " no attached client.\n", c);
+		}
 
 		saved_data_buf += len;
 
-- 
1.9.1