linux-kernel - Re: [PATCH] drivers: fbdev: arcfb: Fix error handling in arcfb

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Message-ID: <b7e5e4b9-a0c9-96aa-e264-a8ccfac5a768@gmx.de>
Date:   Thu, 11 May 2023 17:55:39 +0200
From:   Helge Deller <deller@....de>
To:     Zongjie Li <u202112089@...t.edu.cn>, Andrew Morton <akpm@...l.org>
Cc:     hust-os-kernel-patches@...glegroups.com,
        Dongliang Mu <dzm91@...t.edu.cn>, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: fbdev: arcfb: Fix error handling in
 arcfb_probe()

On 5/9/23 13:27, Zongjie Li wrote:
> Smatch complains that:
> arcfb_probe() warn: 'irq' from request_irq() not released on lines: 587.
>
> Fix error handling in the arcfb_probe() function. If IO addresses are
> not provided or framebuffer registration fails, the code will jump to
> the err_addr or err_register_fb label to release resources.
> If IRQ request fails, previously allocated resources will be freed.
>
> Fixes: 1154ea7dcd8e ("[PATCH] Framebuffer driver for Arc LCD board")
> Signed-off-by: Zongjie Li <u202112089@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>

applied.

Thanks!
Helge

> ---
>   drivers/video/fbdev/arcfb.c | 15 +++++++++------
>   1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/video/fbdev/arcfb.c b/drivers/video/fbdev/arcfb.c
> index 45e64016db32..024d0ee4f04f 100644
> --- a/drivers/video/fbdev/arcfb.c
> +++ b/drivers/video/fbdev/arcfb.c
> @@ -523,7 +523,7 @@ static int arcfb_probe(struct platform_device *dev)
>
>   	info = framebuffer_alloc(sizeof(struct arcfb_par), &dev->dev);
>   	if (!info)
> -		goto err;
> +		goto err_fb_alloc;
>
>   	info->screen_base = (char __iomem *)videomemory;
>   	info->fbops = &arcfb_ops;
> @@ -535,7 +535,7 @@ static int arcfb_probe(struct platform_device *dev)
>
>   	if (!dio_addr || !cio_addr || !c2io_addr) {
>   		printk(KERN_WARNING "no IO addresses supplied\n");
> -		goto err1;
> +		goto err_addr;
>   	}
>   	par->dio_addr = dio_addr;
>   	par->cio_addr = cio_addr;
> @@ -551,12 +551,12 @@ static int arcfb_probe(struct platform_device *dev)
>   			printk(KERN_INFO
>   				"arcfb: Failed req IRQ %d\n", par->irq);
>   			retval = -EBUSY;
> -			goto err1;
> +			goto err_addr;
>   		}
>   	}
>   	retval = register_framebuffer(info);
>   	if (retval < 0)
> -		goto err1;
> +		goto err_register_fb;
>   	platform_set_drvdata(dev, info);
>   	fb_info(info, "Arc frame buffer device, using %dK of video memory\n",
>   		videomemorysize >> 10);
> @@ -580,9 +580,12 @@ static int arcfb_probe(struct platform_device *dev)
>   	}
>
>   	return 0;
> -err1:
> +
> +err_register_fb:
> +	free_irq(par->irq, info);
> +err_addr:
>   	framebuffer_release(info);
> -err:
> +err_fb_alloc:
>   	vfree(videomemory);
>   	return retval;
>   }