libertas: submit RSSI command on tx timeout, to check whether module is dead

We don't necessarily want to reset the device on a TX timeout. But more
often than not, the real cause is that the firmware has crapped itself,
not just that the network is busy. So submit any harmless command, and
if _that_ times out, then the error handling code will reset the module,
as appropriate.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 9677b0d77160b504b17c3f2fe71ff2c194fd85e6..74353e1d72ff29b17cf99b0c63f097e6d760d750 100644 (file)
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -476,6 +476,13 @@ static void lbs_tx_timeout(struct net_device *dev)
           to kick it somehow? */
        lbs_host_to_card_done(priv);
 
+       /* More often than not, this actually happens because the
+          firmware has crapped itself -- rather than just a very
+          busy medium. So send a harmless command, and if/when
+          _that_ times out, we'll kick it in the head. */
+       lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
+                                    0, 0, NULL);
+
        lbs_deb_leave(LBS_DEB_TX);
 }