[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Bug#582972: linux-image-2.6.32-5-amd64: Inserting rtl819xU USB wireless device twice caused kernel error

On Tue, 2010-05-25 at 03:15 +0100, Ben Hutchings wrote: 
> On Tue, 2010-05-25 at 10:59 +1000, Russell Coker wrote:
> > Package: linux-2.6
> > Version: 2.6.32-13
> > Severity: normal
> > 
> > 
> > 
> > -- Package-specific info:
> > ** Version:
> > Linux version 2.6.32-5-amd64 (Debian 2.6.32-12) (ben@decadent.org.uk) (gcc version 4.3.4 (Debian 4.3.4-10) ) #1 SMP Mon May 3 10:42:25 UTC 2010
> > 
> > I inserted the USB wireless device, found it to not allow "ifconfig up",
> > removed it, inserted it again, and got a kernel error.
> [...]
> 
> Not surprising... the driver is doing stupid things in procfs.
> Stay away from this hardware.

I've attached a couple of patches which should fix this.  Please could
you test them?

There are instructions for building a patched kernel based on the Debian
kernel package at
<http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official>.

Ben.

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.


From f5862bda3a106275bdb71cf46184524b8ddfa584 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Tue, 25 May 2010 04:20:30 +0100
Subject: [PATCH 1/2] rtl8192su: Clean up in case of an error in module initialisation

Currently various resources may be leaked in case of an error.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/staging/rtl8192su/r8192U_core.c |   43 ++++++++++++++++++++++++++-----
 1 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/rtl8192su/r8192U_core.c b/drivers/staging/rtl8192su/r8192U_core.c
index 6d52d6a..4da9f48 100644
--- a/drivers/staging/rtl8192su/r8192U_core.c
+++ b/drivers/staging/rtl8192su/r8192U_core.c
@@ -959,10 +959,11 @@ static int proc_get_stats_rx(char *page, char **start,
 	return len;
 }
 
-void rtl8192_proc_module_init(void)
+int rtl8192_proc_module_init(void)
 {
 	RT_TRACE(COMP_INIT, "Initializing proc filesystem");
 	rtl8192_proc=create_proc_entry(RTL819xU_MODULE_NAME, S_IFDIR, init_net.proc_net);
+	return rtl8192_proc ? 0 : -ENOMEM;
 }
 
 
@@ -7564,35 +7565,63 @@ static int __init rtl8192_usb_module_init(void)
 	ret = ieee80211_crypto_init();
 	if (ret) {
 		printk(KERN_ERR "ieee80211_crypto_init() failed %d\n", ret);
-		return ret;
+		goto fail_crypto;
 	}
 
 	ret = ieee80211_crypto_tkip_init();
 	if (ret) {
 		printk(KERN_ERR "ieee80211_crypto_tkip_init() failed %d\n",
 			ret);
-		return ret;
+		goto fail_crypto_tkip;
 	}
 
 	ret = ieee80211_crypto_ccmp_init();
 	if (ret) {
 		printk(KERN_ERR "ieee80211_crypto_ccmp_init() failed %d\n",
 			ret);
-		return ret;
+		goto fail_crypto_ccmp;
 	}
 
 	ret = ieee80211_crypto_wep_init();
 	if (ret) {
 		printk(KERN_ERR "ieee80211_crypto_wep_init() failed %d\n", ret);
-		return ret;
+		goto fail_crypto_wep;
 	}
 
 	printk(KERN_INFO "\nLinux kernel driver for RTL8192 based WLAN cards\n");
 	printk(KERN_INFO "Copyright (c) 2007-2008, Realsil Wlan\n");
 	RT_TRACE(COMP_INIT, "Initializing module");
 	RT_TRACE(COMP_INIT, "Wireless extensions version %d", WIRELESS_EXT);
-	rtl8192_proc_module_init();
-	return usb_register(&rtl8192_usb_driver);
+
+	ret = rtl8192_proc_module_init();
+	if (ret) {
+		pr_err("rtl8192_proc_module_init() failed %d\n", ret);
+		goto fail_proc;
+	}
+
+	ret = usb_register(&rtl8192_usb_driver);
+	if (ret) {
+		pr_err("usb_register() failed %d\n", ret);
+		goto fail_usb;
+	}
+
+	return 0;
+
+fail_usb:
+	rtl8192_proc_module_remove();
+fail_proc:
+	ieee80211_crypto_wep_exit();
+fail_crypto_wep:
+	ieee80211_crypto_ccmp_exit();
+fail_crypto_ccmp:
+	ieee80211_crypto_tkip_exit();
+fail_crypto_tkip:
+	ieee80211_crypto_deinit();
+fail_crypto:
+#ifdef CONFIG_IEEE80211_DEBUG
+	ieee80211_debug_exit();
+#endif
+	return ret;
 }
 
 
-- 
1.7.1


From 10190f6362057a8a314198449731aafff8f0afc5 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Tue, 25 May 2010 04:25:57 +0100
Subject: [PATCH 2/2] rtl8192su: Fix procfs code for interfaces not named wlan0

The current code creates directories in procfs named after interfaces,
but doesn't handle renaming.  This can result in name collisions and
consequent WARNINGs.  It also means that the interface name cannot
reliably be used to remove the directory - in fact the current code
doesn't even try, and always uses "wlan0"!

Since the name of a proc_dir_entry is embedded in it, use that when
removing it.

Add a netdev notifier to catch interface renaming, and remove and
re-add the directory at this point.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/staging/rtl8192su/r8192U_core.c |   35 ++++++++++++++++++++++++++++--
 1 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/rtl8192su/r8192U_core.c b/drivers/staging/rtl8192su/r8192U_core.c
index 4da9f48..473131d 100644
--- a/drivers/staging/rtl8192su/r8192U_core.c
+++ b/drivers/staging/rtl8192su/r8192U_core.c
@@ -25,6 +25,7 @@
  */
 
 #include <linux/vmalloc.h>
+#include <linux/notifier.h>
 
 #undef LOOP_TEST
 #undef DUMP_RX
@@ -160,6 +161,8 @@ MODULE_PARM_DESC(channels," Channel bitmask for specific locales. NYI");
 static int __devinit rtl8192_usb_probe(struct usb_interface *intf,
 			 const struct usb_device_id *id);
 static void __devexit rtl8192_usb_disconnect(struct usb_interface *intf);
+static const struct net_device_ops rtl8192_netdev_ops;
+static struct notifier_block proc_netdev_notifier;
 
 static struct usb_driver rtl8192_usb_driver = {
 	.name		= RTL819xU_MODULE_NAME,	          /* Driver name   */
@@ -961,14 +964,22 @@ static int proc_get_stats_rx(char *page, char **start,
 
 int rtl8192_proc_module_init(void)
 {
+	int ret;
+
 	RT_TRACE(COMP_INIT, "Initializing proc filesystem");
 	rtl8192_proc=create_proc_entry(RTL819xU_MODULE_NAME, S_IFDIR, init_net.proc_net);
-	return rtl8192_proc ? 0 : -ENOMEM;
+	if (!rtl8192_proc)
+		return -ENOMEM;
+	ret = register_netdevice_notifier(&proc_netdev_notifier);
+	if (ret)
+		remove_proc_entry(RTL819xU_MODULE_NAME, init_net.proc_net);
+	return ret;
 }
 
 
 void rtl8192_proc_module_remove(void)
 {
+	unregister_netdevice_notifier(&proc_netdev_notifier);
 	remove_proc_entry(RTL819xU_MODULE_NAME, init_net.proc_net);
 }
 
@@ -996,8 +1007,7 @@ void rtl8192_proc_remove_one(struct net_device *dev)
 		remove_proc_entry("registers-e", priv->dir_dev);
 	//	remove_proc_entry("cck-registers",priv->dir_dev);
 	//	remove_proc_entry("ofdm-registers",priv->dir_dev);
-		//remove_proc_entry(dev->name, rtl8192_proc);
-		remove_proc_entry("wlan0", rtl8192_proc);
+		remove_proc_entry(priv->dir_dev->name, rtl8192_proc);
 		priv->dir_dev = NULL;
 	}
 }
@@ -1114,6 +1124,25 @@ void rtl8192_proc_init_one(struct net_device *dev)
 		      dev->name);
 	}
 }
+
+static int proc_netdev_event(struct notifier_block *this,
+			     unsigned long event, void *ptr)
+{
+	struct net_device *net_dev = ptr;
+
+	if (net_dev->netdev_ops == &rtl8192_netdev_ops &&
+	    event == NETDEV_CHANGENAME) {
+		rtl8192_proc_remove_one(net_dev);
+		rtl8192_proc_init_one(net_dev);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block proc_netdev_notifier = {
+	.notifier_call = proc_netdev_event,
+};
+
 /****************************************************************************
    -----------------------------MISC STUFF-------------------------
 *****************************************************************************/
-- 
1.7.1

Attachment: signature.asc
Description: This is a digitally signed message part

Reply to: