linux-kernel - Re: [RESEND/PATCH] usb: gadget: goku

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Message-ID: <20101004141017.GD5692@bicker>
Date:	Mon, 4 Oct 2010 16:10:17 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Rahul Ruikar <rahul.ruikar@...il.com>
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>, nm127@...email.hu,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND/PATCH] usb: gadget: goku_udc: Fix error path

On Mon, Oct 04, 2010 at 06:54:00PM +0530, Rahul Ruikar wrote:
> Dan,
> 
> Following things I tried to do with this change.
> there can be 3 cases where one need to handle device_register()
> 1) reaching error path but device_register() is never called..( ie,
> error occurred before calling device_register() function call, in this
> case "dev->reg_status" will have value "0" and in error handler
> device_unregister() or put_device() will not be called.
> 

Good point.  This is a bug in the original code.

> 2) error occurred at device_register() ( ie. it fails and calls error
> handler, this way "dev->reg_status" will have value "2" and in error
> handler, based on this value "put_device() will be called.
> 

Yeah.  But device_register() sucks.  It shouldn't require such byzantine
error handling.  Someone is working on this.

regards,
dan carpenter

> 3) error occured after device_register() success. ( ie, error occured
> due to some other function, ) in this case "dev->reg_status" will have
> value "1" and in error handler, based on this value
> "device_unregister" will be called.
> 
> but anyways someone has now proposed to change it to new usb
> interface, so this patch is of no use now.
> 
> Thanks
> Rahul Ruikar
> 

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