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| author | Felix Fietkau <nbd@openwrt.org> | 2011-04-08 20:13:18 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-04-12 22:41:33 +0200 |
| commit | 5882da02e9d9089b7e8c739f3e774aaeeff8b7ba (patch) | |
| tree | a260e6094888a14fc85d687b24606886fc158891 /drivers/net/wireless/ath/ath9k/mac.h | |
| parent | iwlegacy: make iwl3945 and iwl4965 select IWLWIFI_LEGACY (diff) | |
| download | linux-5882da02e9d9089b7e8c739f3e774aaeeff8b7ba.tar.xz linux-5882da02e9d9089b7e8c739f3e774aaeeff8b7ba.zip | |
ath9k_hw: fix stopping rx DMA during resets
During PHY errors, the MAC can sometimes fail to enter an idle state on older
hardware (before AR9380) after an rx stop has been requested.
This typically shows up in the kernel log with messages like these:
ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
------------[ cut here ]------------
WARNING: at drivers/net/wireless/ath/ath9k/recv.c:504 ath_stoprecv+0xcc/0xf0 [ath9k]()
Call Trace:
[<8023f0e8>] dump_stack+0x8/0x34
[<80075050>] warn_slowpath_common+0x78/0xa4
[<80075094>] warn_slowpath_null+0x18/0x24
[<80d66d60>] ath_stoprecv+0xcc/0xf0 [ath9k]
[<80d642cc>] ath_set_channel+0xbc/0x270 [ath9k]
[<80d65254>] ath_radio_disable+0x4a4/0x7fc [ath9k]
When this happens, the state that the MAC enters is easy to identify and
does not result in bogus DMA traffic, however to ensure a working state
after a channel change, the hardware should still be reset.
This patch adds detection for this specific MAC state, after which the above
warnings completely disappear in my tests.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: stable@kernel.org
Cc: Kyungwan Nam <Kyungwan.Nam@Atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/mac.h')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/mac.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath/ath9k/mac.h b/drivers/net/wireless/ath/ath9k/mac.h index b2b2ff852c32..c2a59386fb9c 100644 --- a/drivers/net/wireless/ath/ath9k/mac.h +++ b/drivers/net/wireless/ath/ath9k/mac.h @@ -695,7 +695,7 @@ bool ath9k_hw_setrxabort(struct ath_hw *ah, bool set); void ath9k_hw_putrxbuf(struct ath_hw *ah, u32 rxdp); void ath9k_hw_startpcureceive(struct ath_hw *ah, bool is_scanning); void ath9k_hw_abortpcurecv(struct ath_hw *ah); -bool ath9k_hw_stopdmarecv(struct ath_hw *ah); +bool ath9k_hw_stopdmarecv(struct ath_hw *ah, bool *reset); int ath9k_hw_beaconq_setup(struct ath_hw *ah); /* Interrupt Handling */ |