Staging: wlan-ng: block ioctls until card fully initialised

Add a mutex to block ioctls before the card is fully initialised and
only allow one ioctl at a time.
This stops udev trying to load the firmware before to card is fully up.

patch ported from wlan-ng-devel

Karl Relton <karllinuxtest.relton@ntlworld.com> spotted that this was
missing from the staging version,
http://lists.linux-wlan.com/pipermail/linux-wlan-devel/2009-February/003890.html

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Karl Relton <karllinuxtest.relton@ntlworld.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/wlan-ng/p80211netdev.c

@@ -567,6 +567,8 @@ static int p80211knetdev_do_ioctl(netdevice_t *dev, struct ifreq *ifr, int cmd)
 
 	pr_debug("rx'd ioctl, cmd=%d, len=%d\n", cmd, req->len);
 
+	mutex_lock(&wlandev->ioctl_lock);
+
 #ifdef SIOCETHTOOL
 	if (cmd == SIOCETHTOOL) {
 		result =
@@ -607,6 +609,8 @@ static int p80211knetdev_do_ioctl(netdevice_t *dev, struct ifreq *ifr, int cmd)
 		result = -ENOMEM;
 	}
 bail:
+	mutex_unlock(&wlandev->ioctl_lock);
+
 	return result;		/* If allocate,copyfrom or copyto fails, return errno */
 }
 
@@ -758,6 +762,11 @@ int wlan_setup(wlandevice_t *wlandev)
 		dev->open = p80211knetdev_open;
 		dev->stop = p80211knetdev_stop;
 
+		mutex_init(&wlandev->ioctl_lock);
+		/* block ioctls until fully initialised. Don't forget to call
+		   allow_ioctls at some point!*/
+		mutex_lock(&wlandev->ioctl_lock);
+
 #if (WIRELESS_EXT < 21)
 		dev->get_wireless_stats = p80211wext_get_wireless_stats;
 #endif
@@ -1098,3 +1107,8 @@ static void p80211knetdev_tx_timeout(netdevice_t *netdev)
 		netif_wake_queue(wlandev->netdev);
 	}
 }
+
+void p80211_allow_ioctls(wlandevice_t *wlandev)
+{
+	mutex_unlock(&wlandev->ioctl_lock);
+}

drivers/staging/wlan-ng/p80211netdev.h

@@ -227,6 +227,8 @@ typedef struct wlandevice {
 	u8 spy_number;
 	char spy_address[IW_MAX_SPY][ETH_ALEN];
 	struct iw_quality spy_stat[IW_MAX_SPY];
+
+	struct mutex ioctl_lock;
 } wlandevice_t;
 
 /* WEP stuff */
@@ -242,5 +244,5 @@ int register_wlandev(wlandevice_t *wlandev);
 int unregister_wlandev(wlandevice_t *wlandev);
 void p80211netdev_rx(wlandevice_t *wlandev, struct sk_buff *skb);
 void p80211netdev_hwremoved(wlandevice_t *wlandev);
-
+void p80211_allow_ioctls(wlandevice_t *wlandev);
 #endif

drivers/staging/wlan-ng/prism2usb.c

@@ -170,6 +170,7 @@ failed:
 	wlandev = NULL;
 
 done:
+	p80211_allow_ioctls(wlandev);
 	usb_set_intfdata(interface, wlandev);
 	return result;
 }