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ath9k: merge fixes for stability issues under heavy load

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 40590
This commit is contained in:
Felix Fietkau 2014-04-29 15:52:03 +00:00
parent d33c6f7b80
commit 11c23fded0
1 changed files with 71 additions and 0 deletions
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71
package/kernel/mac80211/patches/300-pending_work.patch
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@ -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)) {