[PATCH] Orinoco: wireless stats updates

  
  Minor updates/bugfixes to the handling of wireless statistics.

drivers/net/wireless/orinoco.c

@@ -686,7 +686,7 @@ static struct iw_statistics *orinoco_get_wireless_stats(struct net_device *dev)
 	struct orinoco_private *priv = netdev_priv(dev);
 	hermes_t *hw = &priv->hw;
 	struct iw_statistics *wstats = &priv->wstats;
-	int err = 0;
+	int err;
 	unsigned long flags;
 
 	if (! netif_device_present(dev)) {
@@ -695,9 +695,21 @@ static struct iw_statistics *orinoco_get_wireless_stats(struct net_device *dev)
 		return NULL; /* FIXME: Can we do better than this? */
 	}
 
+	/* If busy, return the old stats.  Returning NULL may cause
+	 * the interface to disappear from /proc/net/wireless */
 	if (orinoco_lock(priv, &flags) != 0)
-		return NULL;  /* FIXME: Erg, we've been signalled, how
-			       * do we propagate this back up? */
+		return wstats;
+
+	/* We can't really wait for the tallies inquiry command to
+	 * complete, so we just use the previous results and trigger
+	 * a new tallies inquiry command for next time - Jean II */
+	/* FIXME: Really we should wait for the inquiry to come back -
+	 * as it is the stats we give don't make a whole lot of sense.
+	 * Unfortunately, it's not clear how to do that within the
+	 * wireless extensions framework: I think we're in user
+	 * context, but a lock seems to be held by the time we get in
+	 * here so we're not safe to sleep here. */
+	hermes_inquire(hw, HERMES_INQ_TALLIES);
 
 	if (priv->iw_mode == IW_MODE_ADHOC) {
 		memset(&wstats->qual, 0, sizeof(wstats->qual));
@@ -716,25 +728,16 @@ static struct iw_statistics *orinoco_get_wireless_stats(struct net_device *dev)
 
 		err = HERMES_READ_RECORD(hw, USER_BAP,
 					 HERMES_RID_COMMSQUALITY, &cq);
-
-		wstats->qual.qual = (int)le16_to_cpu(cq.qual);
-		wstats->qual.level = (int)le16_to_cpu(cq.signal) - 0x95;
-		wstats->qual.noise = (int)le16_to_cpu(cq.noise) - 0x95;
-		wstats->qual.updated = 7;
+
+		if (!err) {
+			wstats->qual.qual = (int)le16_to_cpu(cq.qual);
+			wstats->qual.level = (int)le16_to_cpu(cq.signal) - 0x95;
+			wstats->qual.noise = (int)le16_to_cpu(cq.noise) - 0x95;
+			wstats->qual.updated = 7;
+		}
 	}
 
-	/* We can't really wait for the tallies inquiry command to
-	 * complete, so we just use the previous results and trigger
-	 * a new tallies inquiry command for next time - Jean II */
-	/* FIXME: We're in user context (I think?), so we should just
-           wait for the tallies to come through */
-	err = hermes_inquire(hw, HERMES_INQ_TALLIES);
-
 	orinoco_unlock(priv, &flags);
-
-	if (err)
-		return NULL;
-
 	return wstats;
 }