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| author | Stanislaw Gruszka <sgruszka@redhat.com> | 2017-05-10 10:54:54 +0200 |
|---|---|---|
| committer | Kalle Valo <kvalo@qca.qualcomm.com> | 2017-05-19 10:59:31 +0300 |
| commit | b01c9e327249e4995e5b5b6cebec14166db9c1e7 (patch) | |
| tree | 2227898336898639c1c4561679a22c2a76ff8fb7 | |
| parent | 641c1f4ab7f62278a3a08c0861725ba21a53e5d5 (diff) | |
| download | linux-b01c9e327249e4995e5b5b6cebec14166db9c1e7.tar.gz linux-b01c9e327249e4995e5b5b6cebec14166db9c1e7.tar.bz2 linux-b01c9e327249e4995e5b5b6cebec14166db9c1e7.zip | |
ath9k: check ah->curchan when updating tx power
When driver fail to reset card ah->curchan value stay NULL. When
later driver try to update tx power it oops by using ah->curchan
(calltrace is shown below).
This problem were reported at various places and for some it was
fixed by making ath9k_hw_chip_reset() do not fail. I have this bug
report on some oldish RHEL kernel with AR9285, however it's hard to
debug where reset fail when kernel OOPS, so I think this patch
should be applied. Hopefully ah->curchan is not used unconditionally
on other places until is initialized on ath9k_config().
ath: phy0: Chip reset failed
ath: phy0: Unable to reset hardware; reset status -22 (freq 2412 MHz)
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<f8a35585>] ath9k_hw_set_txpowerlimit+0x25/0x80 [ath9k_hw]
Oops: 0000 [#1] SMP
<snip>
Call Trace:
[<f8aac1aa>] ? ath9k_cmn_update_txpow+0x1a/0x30 [ath9k_common]
[<f8cf4f4e>] ? ath_complete_reset+0x4e/0x130 [ath9k]
[<f8cf54d7>] ? ath9k_start+0x127/0x1e0 [ath9k]
[<f8c2e52f>] ? ieee80211_do_open+0x30f/0x910 [mac80211]
[<c07bd96d>] ? dev_open+0x8d/0xf0
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/common.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath/ath9k/common.c b/drivers/net/wireless/ath/ath9k/common.c index b80e08b13b74..eea2f7f23a2a 100644 --- a/drivers/net/wireless/ath/ath9k/common.c +++ b/drivers/net/wireless/ath/ath9k/common.c @@ -368,7 +368,7 @@ void ath9k_cmn_update_txpow(struct ath_hw *ah, u16 cur_txpow, { struct ath_regulatory *reg = ath9k_hw_regulatory(ah); - if (reg->power_limit != new_txpow) + if (ah->curchan && reg->power_limit != new_txpow) ath9k_hw_set_txpowerlimit(ah, new_txpow, false); /* read back in case value is clamped */ |