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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>
This commit is contained in:
Tim Harvey 2014-04-21 16:14:57 -07:00 committed by John W. Linville
parent 3a758134e6
commit c82552c5b0
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/ath/ath9k/recv.c
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@ -975,6 +975,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
u64 tsf = 0;
unsigned long flags;
dma_addr_t new_buf_addr;
unsigned int budget = 512;
if (edma)
dma_type = DMA_BIDIRECTIONAL;
@ -1121,6 +1122,9 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
if (!flush)
ath9k_hw_rxena(ah);
}
if (!budget--)
break;
} while (1);
if (!(ah->imask & ATH9K_INT_RXEOL)) {