linux-kernel - Re: [PATCH] USB Elan FTDI: check for driver registration status

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Date:	Tue, 27 Mar 2007 19:14:05 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel-list <linux-kernel@...r.kernel.org>,
	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
Subject: Re: [PATCH] USB Elan FTDI: check for driver registration status

Pete, Luiz

what about this one?

Actually there is just a check for where is error coming from.
Maybe that is not the best solution but it allows us to reduce
the calls to 'printk' :)

P.S. Pete your patch is good but the message about
worqueue creation fail was to print even if we've
been faltered on the usb_register procedure.

---

 drivers/usb/misc/ftdi-elan.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/misc/ftdi-elan.c b/drivers/usb/misc/ftdi-elan.c
index bc3327e..3cd54af 100644
--- a/drivers/usb/misc/ftdi-elan.c
+++ b/drivers/usb/misc/ftdi-elan.c
@@ -2903,7 +2903,7 @@ static struct usb_driver ftdi_elan_driver = {
 };
 static int __init ftdi_elan_init(void)
 {
-        int result;
+        int result = 0;
         printk(KERN_INFO "driver %s built at %s on %s\n", ftdi_elan_driver.name,
 	       __TIME__, __DATE__);
         init_MUTEX(&ftdi_module_lock);
@@ -2918,18 +2918,25 @@ static int __init ftdi_elan_init(void)
 	if (!respond_queue)
 		goto err3;
         result = usb_register(&ftdi_elan_driver);
-        if (result)
+        if (result) {
                 printk(KERN_ERR "usb_register failed. Error number %d\n",
 		       result);
+		goto err4;
+	}
         return result;
 
+ err4:
+	destroy_workqueue(respond_queue);
  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;
+	if (result == 0) {
+		result = -ENOMEM;
+		printk(KERN_ERR "%s couldn't create workqueue\n", ftdi_elan_driver.name);
+	}
+	return result;
 }
 
 static void __exit ftdi_elan_exit(void)


		Cyrill

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