linux-kernel - Re: [PATCH 2/3] firmware: google: Unregister driver

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Message-ID: <246585089f8b0730bc4e0ddae2e6a877009e1307.camel@9elements.com>
Date:   Mon, 18 Nov 2019 08:59:32 +0100
From:   patrick.rudolph@...ements.com
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Arthur Heymans <arthur@...ymans.xyz>,
        Allison Randal <allison@...utok.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexios Zavras <alexios.zavras@...el.com>, furquan@...omium.org
Subject: Re: [PATCH 2/3] firmware: google: Unregister driver_info on failure
 and exit in gsmi

On Sat, 2019-11-16 at 14:40 +0100, Greg Kroah-Hartman wrote:
> On Fri, Nov 15, 2019 at 02:48:38PM +0100, 
> patrick.rudolph@...ements.com wrote:
> > From: Arthur Heymans <arthur@...ymans.xyz>
> > 
> > Fix a bug where the kernel module couldn't be loaded after
> > unloading,
> > as the platform driver wasn't released on exit.
> > 
> > Signed-off-by: Arthur Heymans <arthur@...ymans.xyz>
> > ---
> >  drivers/firmware/google/gsmi.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/drivers/firmware/google/gsmi.c
> > b/drivers/firmware/google/gsmi.c
> > index edaa4e5d84ad..974c769b75cf 100644
> > --- a/drivers/firmware/google/gsmi.c
> > +++ b/drivers/firmware/google/gsmi.c
> > @@ -1016,6 +1016,9 @@ static __init int gsmi_init(void)
> >  	dma_pool_destroy(gsmi_dev.dma_pool);
> >  	platform_device_unregister(gsmi_dev.pdev);
> >  	pr_info("gsmi: failed to load: %d\n", ret);
> > +#ifdef CONFIG_PM
> > +	platform_driver_unregister(&gsmi_driver_info);
> > +#endif
> >  	return ret;
> >  }
> >  
> > @@ -1037,6 +1040,9 @@ static void __exit gsmi_exit(void)
> >  	gsmi_buf_free(gsmi_dev.name_buf);
> >  	dma_pool_destroy(gsmi_dev.dma_pool);
> >  	platform_device_unregister(gsmi_dev.pdev);
> > +#ifdef CONFIG_PM
> > +	platform_driver_unregister(&gsmi_driver_info);
> 
> Why the #ifdef here?  Why does PM change things?
> 
The driver is only registered if CONFIG_PM is selected, thus it only
needs to be unregistered if CONFIG_PM is selected.

See 8942b2d5094b0 for reference.

Regards,
Patrick

> #ifdefs in .c code is really frowned on.
> 
> thanks,
> 
> greg k-h