linux-kernel - Re: [PATCH] board-dm644x-evm: fix 2 missing-check bugs in evm_led

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Message-ID: <20191228131930.GA7214@zhanggen-UX430UQ.lan>
Date:   Sat, 28 Dec 2019 21:19:30 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     nsekhar@...com, bgolaszewski@...libre.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] board-dm644x-evm: fix 2 missing-check bugs in
 evm_led_setup()

On Fri, Dec 27, 2019 at 04:01:42PM +0000, Russell King - ARM Linux admin wrote:
> On Fri, Dec 27, 2019 at 10:39:21AM +0800, Gen Zhang wrote:
> > In evm_led_setup(), the allocation result of platform_device_alloc() and 
> > platform_device_add_data() should be checked.
> > 
> > Signed-off-by: Gen Zhang <blackgod016574@...il.com>
> > ---
> > diff --git a/arch/arm/mach-davinci/board-dm644x-evm.c b/arch/arm/mach-davinci/board-dm644x-evm.c
> > index 9d87d4e..9cd2785 100644
> > --- a/arch/arm/mach-davinci/board-dm644x-evm.c
> > +++ b/arch/arm/mach-davinci/board-dm644x-evm.c
> > @@ -352,15 +352,20 @@ evm_led_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
> >  	 * device unregistration ...
> >  	 */
> >  	evm_led_dev = platform_device_alloc("leds-gpio", 0);
> > -	platform_device_add_data(evm_led_dev,
> > +	if (!evm_led_dev)
> > +		return -ENOMEM;
> > +	status = platform_device_add_data(evm_led_dev,
> >  			&evm_led_data, sizeof evm_led_data);
> > +	if (status)
> > +		goto err;
> >  
> >  	evm_led_dev->dev.parent = &client->dev;
> >  	status = platform_device_add(evm_led_dev);
> > -	if (status < 0) {
> > -		platform_device_put(evm_led_dev);
> > -		evm_led_dev = NULL;
> > -	}
> > +	if (status)
> > +		goto err;
> > +err:
> > +	platform_device_put(evm_led_dev);
> > +	evm_led_dev = NULL;
> 
> Please look again at the above change very closely. You will want to
> send an updated patch.
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
> According to speedtest.net: 11.9Mbps down 500kbps up

Thanks for your reply. You mean the if (state < 0 ) to if (state) or
anything else? Please point out directly.

Best,
Gen