linux-kernel - Re: [RFC 30/42] drivers/usb/host: don't check resource with devm_ioremap

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Message-ID: <20130510180007.GC2912@katana>
Date:	Fri, 10 May 2013 20:00:12 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org
Subject: Re: [RFC 30/42] drivers/usb/host: don't check resource with
 devm_ioremap_resource

On Fri, May 10, 2013 at 10:03:28AM -0400, Alan Stern wrote:
> On Fri, 10 May 2013, Wolfram Sang wrote:
> 
> > devm_ioremap_resource does sanity checks on the given resource. No need to
> > duplicate this in the driver.
> > 
> > Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
> > ---
> >  drivers/usb/host/ehci-atmel.c    |    9 +--------
> >  drivers/usb/host/ehci-mxc.c      |    8 +-------
> >  drivers/usb/host/ehci-platform.c |    6 +-----
> >  drivers/usb/host/ehci-sh.c       |   10 +---------
> >  drivers/usb/host/ohci-nxp.c      |    6 ------
> >  drivers/usb/host/ohci-platform.c |    7 +------
> >  6 files changed, 5 insertions(+), 41 deletions(-)
> > 
> > diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
> > index 6642009..62bf3e6 100644
> > --- a/drivers/usb/host/ehci-atmel.c
> > +++ b/drivers/usb/host/ehci-atmel.c
> > @@ -101,17 +101,10 @@ static int ehci_atmel_drv_probe(struct platform_device *pdev)
> >  		goto fail_create_hcd;
> >  	}
> >  
> > -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > -	if (!res) {
> > -		dev_err(&pdev->dev,
> > -			"Found HC with no register addr. Check %s setup!\n",
> > -			dev_name(&pdev->dev));
> > -		retval = -ENODEV;
> > -		goto fail_request_resource;
> > -	}
> >  	hcd->rsrc_start = res->start;
> >  	hcd->rsrc_len = resource_size(res);
> >  
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >  	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
> 
> This isn't right.  You are now dereferencing an uninitialized pointer
> in the assignment to hcd->rsrc_start.  The compiler won't like that.
> 
> Most of the other changes in this patch suffer from the same problem.

I broke the detection of dereferencing and compile tested an unaffected
kernel. Thanks for pointing out. Will fix!

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