[PATCH] ipw2200: disallow direct scanning when device is down

The function ipw_request_direct_scan() should bail out when the device
is down.  This fixes a lockup caused by wpa_supplicant triggering
ipw_request_direct_scan() while the driver was in a middle of a reset
due to firmware errors.

Thanks to Zilvinas Valinskas for reporting the bug and helping me
debug it.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index b0d195d1721a..374b682e4d6a 100644
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -8926,6 +8926,10 @@ static int ipw_request_direct_scan(struct ipw_priv *priv, char *essid,
         struct ipw_scan_request_ext scan;
         int err = 0, scan_type;
 
+        if (!(priv->status & STATUS_INIT) ||
+            (priv->status & STATUS_EXIT_PENDING))
+                return 0;
+
         down(&priv->sem);
 
         if (priv->status & STATUS_RF_KILL_MASK) {