ath9k: fix a DMA related race condition on reset

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When ath_drain_all_txq fails to stop DMA, it issues a hw reset. This reset
happens at a very problematic point in time, when the hardware rx path has
not been stopped yet. This could lead to memory corruption, hardware hangs
or other issues.
To fix these issues, simply remove the reset entirely and check the tx DMA
stop status to prevent problems with fast channel changes.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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This commit is contained in:

Felix Fietkau 2010-12-05 20:17:53 +01:00 • committed by John W. Linville

parent 841051602e

commit 080e1a259a

3 changed files with 10 additions and 19 deletions

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2

drivers/net/wireless/ath/ath9k/ath9k.h

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5

drivers/net/wireless/ath/ath9k/main.c

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22

drivers/net/wireless/ath/ath9k/xmit.c

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