From fd86cd2272f4b2f862fbdc4dfc1cf21c267ec5bc Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 16 Dec 2015 08:56:10 +0000
Subject: ar71xx: clean up ethernet tx queue after reset, wake queues when done
- fixes hangs reported in #18922
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Backport of r47892
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@47895 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
.../files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
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 dc77699845..7241f14520 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
@@ -30,6 +30,8 @@ MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
#define ETH_SWITCH_HEADER_LEN 2
+static int ag71xx_tx_packets(struct ag71xx *ag, bool flush);
+
static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
{
return ETH_SWITCH_HEADER_LEN + ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
@@ -512,6 +514,7 @@ static void ag71xx_fast_reset(struct ag71xx *ag)
ag71xx_dma_reset(ag);
ag71xx_hw_setup(ag);
+ ag71xx_tx_packets(ag, true);
/* setup max frame length */
ag71xx_wr(ag, AG71XX_REG_MAC_MFL,
@@ -531,6 +534,8 @@ static void ag71xx_hw_start(struct ag71xx *ag)
/* enable interrupts */
ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
+
+ netif_wake_queue(ag->dev);
}
void ag71xx_link_adjust(struct ag71xx *ag)
@@ -898,7 +903,7 @@ static bool ag71xx_check_dma_stuck(struct ag71xx *ag, unsigned long timestamp)
return false;
}
-static int ag71xx_tx_packets(struct ag71xx *ag)
+static int ag71xx_tx_packets(struct ag71xx *ag, bool flush)
{
struct ag71xx_ring *ring = &ag->tx_ring;
struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
@@ -913,7 +918,7 @@ static int ag71xx_tx_packets(struct ag71xx *ag)
struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
struct sk_buff *skb = ring->buf[i].skb;
- if (!ag71xx_desc_empty(desc)) {
+ if (!flush && !ag71xx_desc_empty(desc)) {
if (pdata->is_ar7240 &&
ag71xx_check_dma_stuck(ag, ring->buf[i].timestamp))
schedule_work(&ag->restart_work);
@@ -1039,7 +1044,7 @@ static int ag71xx_poll(struct napi_struct *napi, int limit)
int rx_done;
pdata->ddr_flush();
- tx_done = ag71xx_tx_packets(ag);
+ tx_done = ag71xx_tx_packets(ag, false);
DBG("%s: processing RX ring\n", dev->name);
rx_done = ag71xx_rx_packets(ag, limit);
--
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