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

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Date:	Tue, 27 Mar 2007 21:01:25 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
Cc:	Pete Zaitcev <zaitcev@...hat.com>,
	linux-kernel-list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] USB Elan FTDI: check for driver registration status

[Luiz Fernando N. Capitulino - Tue, Mar 27, 2007 at 01:28:39PM -0300]
| Em Tue, 27 Mar 2007 19:14:05 +0400
| Cyrill Gorcunov <gorcunov@...il.com> escreveu:
| 
| | 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;
| |  }
| 
|  I still the prefer the version I sent you yesterday. :) It
| changes the minimal amount of code.
| 
| -- 
| Luiz Fernando N. Capitulino
| 

Liuz,

but the patch you sent me does call

	printk(KERN_ERR "%s couldn't create workqueue\n", ftdi_elan_driver.name);

even if error occured in usb_register and that is not good I think.
Fix me if I'm wrong.

		Cyrill

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