netdev - [PATCH] hso: fix for crash when unplugging the device

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Message-ID: <20090330094242.GB9849@raptor>
Date:	Mon, 30 Mar 2009 11:42:42 +0200
From:	Jan Dumon <j.dumon@...ion.com>
To:	linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH] hso: fix for crash when unplugging the device

From: Jan Dumon <j.dumon@...ion.com>
    
Changed the order in which things are freed. This fixes an oops when
unplugging the device while network traffic is ongoing.

Signed-off-by: Jan Dumon <j.dumon@...ion.com>
---
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index fe98aca..a9320db 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -5,6 +5,7 @@
  *  Copyright (C) 2008 Option International
  *                     Filip Aben <f.aben@...ion.com>
  *                     Denis Joseph Barrow <d.barow@...ion.com>
+ *                     Jan Dumon <j.dumon@...ion.com>
  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
  *  			<ajb@...eresystems.co.uk>
  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@...e.de>
@@ -2417,20 +2418,22 @@ static void hso_free_net_device(struct hso_device *hso_dev)
 	if (!hso_net)
 		return;
 
+	remove_net_device(hso_net->parent);
+
+	if (hso_net->net) {
+		unregister_netdev(hso_net->net);
+		free_netdev(hso_net->net);
+	}
+
 	/* start freeing */
 	for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
 		usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
 		kfree(hso_net->mux_bulk_rx_buf_pool[i]);
+		hso_net->mux_bulk_rx_buf_pool[i] = NULL;
 	}
 	usb_free_urb(hso_net->mux_bulk_tx_urb);
 	kfree(hso_net->mux_bulk_tx_buf);
-
-	remove_net_device(hso_net->parent);
-
-	if (hso_net->net) {
-		unregister_netdev(hso_net->net);
-		free_netdev(hso_net->net);
-	}
+	hso_net->mux_bulk_tx_buf = NULL;
 
 	hso_free_device(hso_dev);
 }
@@ -2616,12 +2619,12 @@ static void hso_free_tiomget(struct hso_serial *serial)
 {
 	struct hso_tiocmget *tiocmget = serial->tiocmget;
 	if (tiocmget) {
-		kfree(tiocmget);
 		if (tiocmget->urb) {
 			usb_free_urb(tiocmget->urb);
 			tiocmget->urb = NULL;
 		}
 		serial->tiocmget = NULL;
+		kfree(tiocmget);
 
 	}
 }
--
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