From 2da2317feda8c509299b6a890cdfbdf243c00436 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 6 Sep 2014 17:51:44 +0000
Subject: ar71xx: fix off-by-one error in packet descriptor splitting (patch
from #13072)
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 42428
---
.../ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
(limited to 'target/linux/ar71xx/files/drivers')
diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
index ed04033341..c04fb94b94 100644
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
@@ -704,7 +704,12 @@ static int ag71xx_fill_dma_desc(struct ag71xx_ring *ring, u32 addr, int len)
if (cur_len > split) {
cur_len = split;
- if (len < split + 4)
+
+ /*
+ * TX will hang if DMA transfers <= 4 bytes,
+ * make sure next segment is more than 4 bytes long.
+ */
+ if (len <= split + 4)
cur_len -= 4;
}
--
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