linux-kernel - Re: [PATCH v4] video: fbdev: arcfb: add missed free_irq and fix the order of request

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Date:   Fri, 17 Apr 2020 16:08:20 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] video: fbdev: arcfb: add missed free_irq and fix the
 order of request_irq


On 3/24/20 2:23 PM, Chuhong Yuan wrote:
> The driver forgets to free irq in remove which is requested in
> probe.
> Add the missed call to fix it.
> Also, the position of request_irq() in probe should be put before
> register_framebuffer().
> 
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>

Patch queued for v5.8, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
> Changes in v4:
>   - Use info->par->irq instead of par->irq to avoid dereferencing NULL pointer.
> 
>  drivers/video/fbdev/arcfb.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/video/fbdev/arcfb.c b/drivers/video/fbdev/arcfb.c
> index 314ab82e01c0..6f7838979f0a 100644
> --- a/drivers/video/fbdev/arcfb.c
> +++ b/drivers/video/fbdev/arcfb.c
> @@ -544,10 +544,6 @@ static int arcfb_probe(struct platform_device *dev)
>  	par->cslut[1] = 0x06;
>  	info->flags = FBINFO_FLAG_DEFAULT;
>  	spin_lock_init(&par->lock);
> -	retval = register_framebuffer(info);
> -	if (retval < 0)
> -		goto err1;
> -	platform_set_drvdata(dev, info);
>  	if (irq) {
>  		par->irq = irq;
>  		if (request_irq(par->irq, &arcfb_interrupt, IRQF_SHARED,
> @@ -558,6 +554,10 @@ static int arcfb_probe(struct platform_device *dev)
>  			goto err1;
>  		}
>  	}
> +	retval = register_framebuffer(info);
> +	if (retval < 0)
> +		goto err1;
> +	platform_set_drvdata(dev, info);
>  	fb_info(info, "Arc frame buffer device, using %dK of video memory\n",
>  		videomemorysize >> 10);
>  
> @@ -593,6 +593,8 @@ static int arcfb_remove(struct platform_device *dev)
>  
>  	if (info) {
>  		unregister_framebuffer(info);
> +		if (irq)
> +			free_irq(((struct arcfb_par *)(info->par))->irq, info);
>  		vfree((void __force *)info->screen_base);
>  		framebuffer_release(info);
>  	}
>