[PATCH] wireless/airo: clean up WEXT association and scan events

Airo firmware versions >= 5.30.17 send re-association events to the
driver that are currently unrecognized, causing spurious disassociation
events to be sent to user space.  Loss of sync due to scan requests also
results in disassociation events sent to user space.  This patch traps
those two events; suppressing sync-loss on scan, and sending the correct
association event on re-association notifications.
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/airo.c

@@ -3139,6 +3139,7 @@ static irqreturn_t airo_interrupt ( int irq, void* dev_id, struct pt_regs *regs)
 		}
 		if ( status & EV_LINK ) {
 			union iwreq_data	wrqu;
+			int scan_forceloss = 0;
 			/* The link status has changed, if you want to put a
 			   monitor hook in, do it here.  (Remember that
 			   interrupts are still disabled!)
@@ -3157,7 +3158,8 @@ static irqreturn_t airo_interrupt ( int irq, void* dev_id, struct pt_regs *regs)
 			  code) */
 #define AUTHFAIL 0x0300 /* Authentication failure (low byte is reason
 			   code) */
-#define ASSOCIATED 0x0400 /* Assocatied */
+#define ASSOCIATED 0x0400 /* Associated */
+#define REASSOCIATED 0x0600 /* Reassociated?  Only on firmware >= 5.30.17 */
 #define RC_RESERVED 0 /* Reserved return code */
 #define RC_NOREASON 1 /* Unspecified reason */
 #define RC_AUTHINV 2 /* Previous authentication invalid */
@@ -3174,44 +3176,30 @@ static irqreturn_t airo_interrupt ( int irq, void* dev_id, struct pt_regs *regs)
 			  leaving BSS */
 #define RC_NOAUTH 9 /* Station requesting (Re)Association is not
 		       Authenticated with the responding station */
-			if (newStatus != ASSOCIATED) {
-				if (auto_wep && !apriv->expires) {
-					apriv->expires = RUN_AT(3*HZ);
-					wake_up_interruptible(&apriv->thr_wait);
-				}
-			} else {
-				struct task_struct *task = apriv->task;
+			if (newStatus == FORCELOSS && apriv->scan_timeout > 0)
+				scan_forceloss = 1;
+			if(newStatus == ASSOCIATED || newStatus == REASSOCIATED) {
 				if (auto_wep)
 					apriv->expires = 0;
-				if (task)
-					wake_up_process (task);
+				if (apriv->task)
+					wake_up_process (apriv->task);
 				set_bit(FLAG_UPDATE_UNI, &apriv->flags);
 				set_bit(FLAG_UPDATE_MULTI, &apriv->flags);
-			}
-			/* Question : is ASSOCIATED the only status
-			 * that is valid ? We want to catch handover
-			 * and reassociations as valid status
-			 * Jean II */
-			if(newStatus == ASSOCIATED) {
-#if 0
-				/* FIXME: Grabbing scan results here
-				 * seems to be too early???  Just wait for
-				 * timeout instead. */
-				if (apriv->scan_timeout > 0) {
-					set_bit(JOB_SCAN_RESULTS, &apriv->flags);
-					wake_up_interruptible(&apriv->thr_wait);
-				}
-#endif
+
 				if (down_trylock(&apriv->sem) != 0) {
 					set_bit(JOB_EVENT, &apriv->flags);
 					wake_up_interruptible(&apriv->thr_wait);
 				} else
 					airo_send_event(dev);
-			} else {
-				memset(wrqu.ap_addr.sa_data, '\0', ETH_ALEN);
-				wrqu.ap_addr.sa_family = ARPHRD_ETHER;
+			} else if (!scan_forceloss) {
+				if (auto_wep && !apriv->expires) {
+					apriv->expires = RUN_AT(3*HZ);
+					wake_up_interruptible(&apriv->thr_wait);
+				}
 
 				/* Send event to user space */
+				memset(wrqu.ap_addr.sa_data, '\0', ETH_ALEN);
+				wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 				wireless_send_event(dev, SIOCGIWAP, &wrqu,NULL);
 			}
 		}
@@ -7136,10 +7124,10 @@ static int airo_set_scan(struct net_device *dev,
 		goto out;
 
 	/* Initiate a scan command */
+	ai->scan_timeout = RUN_AT(3*HZ);
 	memset(&cmd, 0, sizeof(cmd));
 	cmd.cmd=CMD_LISTBSS;
 	issuecommand(ai, &cmd, &rsp);
-	ai->scan_timeout = RUN_AT(3*HZ);
 	wake = 1;
 
 out: