linux-kernel - Re: pnp_bus_resume(): inconsequent NULL checking

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Message-ID: <47BD1069.1060109@keyaccess.nl>
Date:	Thu, 21 Feb 2008 06:47:21 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Adrian Bunk <bunk@...nel.org>, ambx1@....rr.com,
	linux-kernel@...r.kernel.org
Subject: Re: pnp_bus_resume(): inconsequent NULL checking

On 20-02-08 17:59, Bjorn Helgaas wrote:

> I agree with you that we can just delete the dev->protocol tests
> completely. So I'd rather see something like this (built but untested):
> 
> 
> PNP: remove dev->protocol NULL checks
> 
> Every PNP device should have a valid protocol pointer.  If it doesn't,
> something's wrong and we should oops so we can find and fix the problem.
> 
> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>

Ack from a functional standpoint: we are oopsing in pnp_start/stop_dev 
_anyway_ if the protocol pointer isn't set.

Will you coach this upstream? A 2.6.25-rc1 change from me made the coverity 
checker pick up on it which might be considered enough of an excuse to call 
it a regression and submit this as a fix...

> Index: work6/drivers/pnp/driver.c
> ===================================================================
> --- work6.orig/drivers/pnp/driver.c	2008-02-20 09:46:01.000000000 -0700
> +++ work6/drivers/pnp/driver.c	2008-02-20 09:46:28.000000000 -0700
> @@ -167,7 +167,7 @@
>  			return error;
>  	}
>  
> -	if (pnp_dev->protocol && pnp_dev->protocol->suspend)
> +	if (pnp_dev->protocol->suspend)
>  		pnp_dev->protocol->suspend(pnp_dev, state);
>  	return 0;
>  }
> @@ -181,7 +181,7 @@
>  	if (!pnp_drv)
>  		return 0;
>  
> -	if (pnp_dev->protocol && pnp_dev->protocol->resume)
> +	if (pnp_dev->protocol->resume)
>  		pnp_dev->protocol->resume(pnp_dev);
>  
>  	if (pnp_can_write(pnp_dev)) {
> 

Rene.
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