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ath9k: Fix issue with parsing malformed CFP IE

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All QCA chips have the ability to parse the CF Parameter Set
IE in beacons. If the IE is malformed in the beacons from some
APs [1], the HW locks up. In AP mode, a beacon stuck would happen
and in client mode, a disconnection usually is the result.

To fix this issue, set the AR_PCU_MISC_MODE2_CFP_IGNORE to ignore
the CFP IE in beacons - this is applicable for all chips. For
AP mode, if this issue happens, the NAV is also corrupted and has
to be reset - this will be done in a subsequent patch.

[1] : http://msujith.org/ath9k/cfp/Malformed-CF-Param.png

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2013-09-11 11:40:58 +05:30 committed by John W. Linville
parent c694545568
commit 9ef4893234
2 changed files with 6 additions and 2 deletions
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2
drivers/net/wireless/ath/ath9k/ar5008_phy.c
View file

@ -626,6 +626,8 @@ static void ar5008_hw_override_ini(struct ath_hw *ah,
if (AR_SREV_9287_11_OR_LATER(ah))
val = val & (~AR_PCU_MISC_MODE2_HWWAR2);
val |= AR_PCU_MISC_MODE2_CFP_IGNORE;
REG_WRITE(ah, AR_PCU_MISC_MODE2, val);
}

6
drivers/net/wireless/ath/ath9k/ar9003_phy.c
View file

@ -627,8 +627,10 @@ static void ar9003_hw_override_ini(struct ath_hw *ah)
* MAC addr only will fail.
*/
val = REG_READ(ah, AR_PCU_MISC_MODE2) & (~AR_ADHOC_MCAST_KEYID_ENABLE);
REG_WRITE(ah, AR_PCU_MISC_MODE2,
val | AR_AGG_WEP_ENABLE_FIX | AR_AGG_WEP_ENABLE);
val |= AR_AGG_WEP_ENABLE_FIX |
AR_AGG_WEP_ENABLE |
AR_PCU_MISC_MODE2_CFP_IGNORE;
REG_WRITE(ah, AR_PCU_MISC_MODE2, val);
REG_SET_BIT(ah, AR_PHY_CCK_DETECT,
AR_PHY_CCK_DETECT_BB_ENABLE_ANT_FAST_DIV);