From 11c23fded0b45bb50a1292d559e7e368d6844a22 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Tue, 29 Apr 2014 15:52:03 +0000
Subject: ath9k: merge fixes for stability issues under heavy load
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 40590
---
.../kernel/mac80211/patches/300-pending_work.patch | 71 ++++++++++++++++++++++
1 file changed, 71 insertions(+)
(limited to 'package/kernel')
diff --git a/package/kernel/mac80211/patches/300-pending_work.patch b/package/kernel/mac80211/patches/300-pending_work.patch
index 90dd5e7..d6d042d 100644
--- a/package/kernel/mac80211/patches/300-pending_work.patch
+++ b/package/kernel/mac80211/patches/300-pending_work.patch
@@ -1,3 +1,43 @@
+commit c82552c5b0cb1735dbcbad78b1ffc6d3c212dc56
+Author: Tim Harvey <tharvey@gateworks.com>
+Date: Mon Apr 21 16:14:57 2014 -0700
+
+ ath9k: add a recv budget
+
+ Implement a recv budget so that in cases of high traffic we still allow other
+ taskets to get processed.
+
+ Without this, we can encounter a host of issues during high wireless traffic
+ reception depending on system load including rcu stall's detected (ARM),
+ soft lockups, failure to service critical tasks such as watchdog resets,
+ and triggering of the tx stuck tasklet.
+
+ The same thing was proposed previously by Ben:
+ http://www.spinics.net/lists/linux-wireless/msg112891.html
+
+ The only difference here is that I make sure only processed packets are counted
+ in the budget by checking at the end of the rx loop.
+
+ Signed-off-by: Tim Harvey <tharvey@gateworks.com>
+ Acked-by: Felix Fietkau <nbd@openwrt.org>
+ Signed-off-by: John W. Linville <linville@tuxdriver.com>
+
+commit 3a758134e66ca74a9df792616b5288b2fa2cfd7f
+Author: Tim Harvey <tharvey@gateworks.com>
+Date: Mon Apr 21 16:14:56 2014 -0700
+
+ ath9k: fix possible hang on flush
+
+ If a flush is requested, make sure to clear the descriptor once we've
+ processed it.
+
+ This resolves a hang that will occur if all RX descriptors are full when a
+ flush is requested.
+
+ Signed-off-by: Tim Harvey <tharvey@gateworks.com>
+ Acked-by: Felix Fietkau <nbd@openwrt.org>
+ Signed-off-by: John W. Linville <linville@tuxdriver.com>
+
commit eefb1d6adc4c60d219182b8917e4567484ce07fc
Author: Felix Fietkau <nbd@openwrt.org>
Date: Mon Apr 28 18:27:41 2014 +0200
@@ -237,3 +277,34 @@ Date: Sun Apr 6 23:35:28 2014 +0200
tid->active = false;
__skb_queue_head_init(&tid->buf_q);
__skb_queue_head_init(&tid->retry_q);
+--- a/drivers/net/wireless/ath/ath9k/recv.c
++++ b/drivers/net/wireless/ath/ath9k/recv.c
+@@ -975,6 +975,7 @@ int ath_rx_tasklet(struct ath_softc *sc,
+ u64 tsf = 0;
+ unsigned long flags;
+ dma_addr_t new_buf_addr;
++ unsigned int budget = 512;
+
+ if (edma)
+ dma_type = DMA_BIDIRECTIONAL;
+@@ -1113,15 +1114,17 @@ requeue_drop_frag:
+ }
+ requeue:
+ list_add_tail(&bf->list, &sc->rx.rxbuf);
+- if (flush)
+- continue;
+
+ if (edma) {
+ ath_rx_edma_buf_link(sc, qtype);
+ } else {
+ ath_rx_buf_relink(sc, bf);
+- ath9k_hw_rxena(ah);
++ if (!flush)
++ ath9k_hw_rxena(ah);
+ }
++
++ if (!budget--)
++ break;
+ } while (1);
+
+ if (!(ah->imask & ATH9K_INT_RXEOL)) {
--
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