linux-kernel - [PATCH] USB Elan FTDI: check for workqueue creation v2

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Date:	Sat, 24 Feb 2007 10:41:15 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	linux-kernel-list <linux-kernel@...r.kernel.org>
Subject: [PATCH] USB Elan FTDI: check for workqueue creation v2

This patch prevents from NULL pointer usage if
workqueue creation failed.

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>

---

Btw, Pete, you are right! C99 ANSI standart says that static pointer
if it not initialized explicitly has to be set to NULL by compiler ;)
Thanks a lot for comments and Ack the patch please.

 drivers/usb/misc/ftdi-elan.c |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/misc/ftdi-elan.c b/drivers/usb/misc/ftdi-elan.c
index 0c1d66d..bc3327e 100644
--- a/drivers/usb/misc/ftdi-elan.c
+++ b/drivers/usb/misc/ftdi-elan.c
@@ -2905,17 +2905,31 @@ static int __init ftdi_elan_init(void)
 {
         int result;
         printk(KERN_INFO "driver %s built at %s on %s\n", ftdi_elan_driver.name,
-                 __TIME__, __DATE__);
+	       __TIME__, __DATE__);
         init_MUTEX(&ftdi_module_lock);
         INIT_LIST_HEAD(&ftdi_static_list);
         status_queue = create_singlethread_workqueue("ftdi-status-control");
+	if (!status_queue)
+		goto err1;
         command_queue = create_singlethread_workqueue("ftdi-command-engine");
+	if (!command_queue)
+		goto err2;
         respond_queue = create_singlethread_workqueue("ftdi-respond-engine");
+	if (!respond_queue)
+		goto err3;
         result = usb_register(&ftdi_elan_driver);
         if (result)
                 printk(KERN_ERR "usb_register failed. Error number %d\n",
-                        result);
+		       result);
         return result;
+
+ err3:
+	destroy_workqueue(command_queue);
+ err2:
+	destroy_workqueue(status_queue);
+ err1:
+	printk(KERN_ERR "%s couldn't create workqueue\n", ftdi_elan_driver.name);
+	return -ENOMEM;
 }
 
 static void __exit ftdi_elan_exit(void)
-
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