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mac80211: don't check rates on PLCP error frames 

Frames that failed PLCP error checks are most likely
microwave transmissions (well, maybe not ...) and
don't have a proper rate detected, so ignore it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2010-07-30 13:23:12 +02:00 committed by John W. Linville
parent 86df5f7284
commit fc88518916
1 changed files with 29 additions and 20 deletions
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49
net/mac80211/rx.c
View File

@ -2615,28 +2615,37 @@ void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
if (WARN_ON(!local->started))
goto drop;
if (status->flag & RX_FLAG_HT) {
if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
/*
* rate_idx is MCS index, which can be [0-76] as documented on:
*
* http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
*
* Anything else would be some sort of driver or hardware error.
* The driver should catch hardware errors.
* Validate the rate, unless a PLCP error means that
* we probably can't have a valid rate here anyway.
*/
if (WARN((status->rate_idx < 0 ||
status->rate_idx > 76),
"Rate marked as an HT rate but passed "
"status->rate_idx is not "
"an MCS index [0-76]: %d (0x%02x)\n",
status->rate_idx,
status->rate_idx))
goto drop;
} else {
if (WARN_ON(status->rate_idx < 0 ||
status->rate_idx >= sband->n_bitrates))
goto drop;
rate = &sband->bitrates[status->rate_idx];
if (status->flag & RX_FLAG_HT) {
/*
* rate_idx is MCS index, which can be [0-76]
* as documented on:
*
* http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
*
* Anything else would be some sort of driver or
* hardware error. The driver should catch hardware
* errors.
*/
if (WARN((status->rate_idx < 0 ||
status->rate_idx > 76),
"Rate marked as an HT rate but passed "
"status->rate_idx is not "
"an MCS index [0-76]: %d (0x%02x)\n",
status->rate_idx,
status->rate_idx))
goto drop;
} else {
if (WARN_ON(status->rate_idx < 0 ||
status->rate_idx >= sband->n_bitrates))
goto drop;
rate = &sband->bitrates[status->rate_idx];
}
}
/*