linux-kernel - Re: question about drivers/rtc/rtc-cmos.c

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Date:	Fri, 27 Dec 2013 23:32:56 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Julia Lawall <julia.lawall@...6.fr>, a.zummo@...ertech.it,
	grant.likely@...aro.org, robh+dt@...nel.org,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: question about drivers/rtc/rtc-cmos.c



On Fri, 27 Dec 2013, Andrew Morton wrote:

> On Wed, 25 Dec 2013 20:32:12 +0100 (CET) Julia Lawall <julia.lawall@...6.fr> wrote:
> 
> > The function cmos_do_probe contains the code:
> > 
> > 		if (is_hpet_enabled()) {
> >                         int err;
> > 
> >                         rtc_cmos_int_handler = hpet_rtc_interrupt;
> > 			err = hpet_register_irq_handler(cmos_interrupt);
> >                         if (err != 0) {
> >                                 dev_warn(dev, "hpet_register_irq_handler "
> >                                                 " failed in rtc_init().");
> >                                 goto cleanup1;
> >                         }
> >                 }
> > 
> > Is it intentional that the error code returned by 
> > hpet_register_irq_handler is put ina local variable that will not be seen 
> > at label cleanup1?  The return value is retval, which is 0 at this point.
> 
> No, I'd say that's a bug.  How does this look?

That is what I was going to propose.

julia


> 
> 
> From: Andrew Morton <akpm@...ux-foundation.org>
> Subject: drivers/rtc/rtc-cmos.c: propagate hpet_register_irq_handler() failure
> 
> If hpet_register_irq_handler() fails, cmos_do_probe() will incorrectly
> return 0.
> 
> Reported-by: Julia Lawall <julia.lawall@...6.fr>
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Grant Likely <grant.likely@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  drivers/rtc/rtc-cmos.c |    6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff -puN drivers/rtc/rtc-cmos.c~drivers-rtc-rtc-cmosc-propagate-hpet_register_irq_handler-failure drivers/rtc/rtc-cmos.c
> --- a/drivers/rtc/rtc-cmos.c~drivers-rtc-rtc-cmosc-propagate-hpet_register_irq_handler-failure
> +++ a/drivers/rtc/rtc-cmos.c
> @@ -708,11 +708,9 @@ cmos_do_probe(struct device *dev, struct
>  		irq_handler_t rtc_cmos_int_handler;
>  
>  		if (is_hpet_enabled()) {
> -			int err;
> -
>  			rtc_cmos_int_handler = hpet_rtc_interrupt;
> -			err = hpet_register_irq_handler(cmos_interrupt);
> -			if (err != 0) {
> +			retval = hpet_register_irq_handler(cmos_interrupt);
> +			if (retval) {
>  				dev_warn(dev, "hpet_register_irq_handler "
>  						" failed in rtc_init().");
>  				goto cleanup1;
> _
> 
> 
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