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mac80211: fix max HT rate processing on mac80211 

The max MCS index is 76, fix the higher check to allow through
frames received at MCS 76. This is a non-issue for current drivers
as MCS 76 is only possible with a device supporting 4 spatial
streams.

While at it change the WARN_ON() on invalid HT rates to a WARN()
to provide more useful information. This will help debug issues
when the driver is passing up a bogus HT rate value.

The rate must map to a valid MCS index which can be any of the
values in the set [0 - 76] (inclusive).

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-11-09 16:03:22 -05:00 committed by John W. Linville
parent b34e620faa
commit e5d6eb8305
1 changed files with 15 additions and 3 deletions
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18
net/mac80211/rx.c
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@ -2441,9 +2441,21 @@ void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
goto drop;
if (status->flag & RX_FLAG_HT) {
/* rate_idx is MCS index */
if (WARN_ON(status->rate_idx < 0 ||
status->rate_idx >= 76))
/*
* 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;
/* HT rates are not in the table - use the highest legacy rate
* for now since other parts of mac80211 may not yet be fully