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ath9k: detect more kinds of invalid descriptors

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If AR_CRCErr, AR_PHYErr, AR_DecryptCRCErr or AR_MichaelErr is indicated
in the rx status word, but AR_RxFrameOK is also set, the descriptor
contents are typically invalid. This can show up as a warning about
invalid MCS rates in a frame. Even with those checks in place, a
descriptor with invalid MCS rates can still sometimes make it through to
the driver (mostly on older hardware like AR91xx).

Detect such errors in the last descriptor of a frame and discard the
whole frame if present.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau
2013-04-08 00:04:12 +02:00
committed by John W. Linville
parent 723e711356
commit 3747c3eef6
3 changed files with 11 additions and 0 deletions
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8
drivers/net/wireless/ath/ath9k/mac.c
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@@ -615,6 +615,14 @@ int ath9k_hw_rxprocdesc(struct ath_hw *ah, struct ath_desc *ds,
rs->rs_status |= ATH9K_RXERR_DECRYPT;
else if (ads.ds_rxstatus8 & AR_MichaelErr)
rs->rs_status |= ATH9K_RXERR_MIC;
} else {
if (ads.ds_rxstatus8 &
(AR_CRCErr | AR_PHYErr | AR_DecryptCRCErr | AR_MichaelErr))
rs->rs_status |= ATH9K_RXERR_CORRUPT_DESC;
/* Only up to MCS16 supported, everything above is invalid */
if (rs->rs_rate >= 0x90)
rs->rs_status |= ATH9K_RXERR_CORRUPT_DESC;
}
if (ads.ds_rxstatus8 & AR_KeyMiss)