p54: fix WARN_ON at line 2247 of net/mac80211/rx.c

This patch hopefully fixes a mac80211<->p54 interaction problem, which was
described by Larry Finger (ref: http://marc.info/?l=linux-wireless&m=123009889327707 )

I guess the warning was triggered by pending frames in the receive queue,
while we're doing a band change 5GHz.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index 37294a657f8b..cba89ed0f572 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -586,6 +586,7 @@ static int p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb)
         u16 freq = le16_to_cpu(hdr->freq);
         size_t header_len = sizeof(*hdr);
         u32 tsf32;
+        u8 rate = hdr->rate & 0xf;
 
         /*
          * If the device is in a unspecified state we have to
@@ -614,8 +615,11 @@ static int p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb)
         rx_status.qual = (100 * hdr->rssi) / 127;
         if (hdr->rate & 0x10)
                 rx_status.flag |= RX_FLAG_SHORTPRE;
-        rx_status.rate_idx = (dev->conf.channel->band == IEEE80211_BAND_2GHZ ?
-                        hdr->rate : (hdr->rate - 4)) & 0xf;
+        if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
+                rx_status.rate_idx = (rate < 4) ? 0 : rate - 4;
+        else
+                rx_status.rate_idx = rate;
+
         rx_status.freq = freq;
         rx_status.band =  dev->conf.channel->band;
         rx_status.antenna = hdr->antenna;