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authorIvo van Doorn <ivdoorn@gmail.com>2008-03-25 14:12:45 +0100
committerJohn W. Linville <linville@tuxdriver.com>2008-03-25 16:42:00 -0400
commit866a05038481d77cac6fc0186250b4c44e691b42 (patch)
treeb3fbc8285add39912effb4e67f33e5435e67a86f /drivers/net/wireless
parent49d20fac21d5207f3930401d0198ac46ad990bff (diff)
rt2x00: Fix rate detection for invalid signals
It has been observed on rt2500pci hardware that some frames received with signal 0x0C do not have the OFDM flag set. Signals can have 2 meanings: 1) The PLCP value 2) The bitrate * 10 For rt2500pci (1) is for frames received with a OFDM rate, and (2) is for frames received with a CCK rate. But 0x0C is a invalid bitrate value but is a valid PLCP value for 54Mbs (obvious OFDM rate). This means that it is possible that the hardware does not set the OFDM bit correctly under all circumstances. This results in rt2x00 failing to detect the rate and mac80211 triggering a WARN_ON() and dropping the frame. To bypass this, print a warning when such a frame is received, and reset the rate to the lowest supported rate for the current band. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00dev.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 4fd0c25aebf..f52e92512f9 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -589,6 +589,13 @@ void rt2x00lib_rxdone(struct queue_entry *entry,
}
}
+ if (idx < 0) {
+ WARNING(rt2x00dev, "Frame received with unrecognized signal,"
+ "signal=0x%.2x, plcp=%d.\n", rxdesc->signal,
+ !!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP));
+ idx = 0;
+ }
+
/*
* Only update link status if this is a beacon frame carrying our bssid.
*/