linux-kernel - Re: [PATCH -next v2] m68k: virt: platform: fix missing platform_device_unregister() on error in virt_platform

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Date:   Tue, 28 Jun 2022 12:45:46 +0200
From:   Laurent Vivier <laurent@...ier.eu>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org
Cc:     geert@...ux-m68k.org
Subject: Re: [PATCH -next v2] m68k: virt: platform: fix missing
 platform_device_unregister() on error in virt_platform_init()

Le 28/06/2022 à 10:49, Yang Yingliang a écrit :
> Add the missing platform_device_unregister() before return
> from virt_platform_init() in the error handling case.
> 
> Fixes: 05d51e42df06 ("m68k: Introduce a virtual m68k machine")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
> v2:
>    change for loop to while at lable err_unregister_rtc_virtio.
> ---
>   arch/m68k/virt/platform.c | 58 ++++++++++++++++++++++-----------------
>   1 file changed, 33 insertions(+), 25 deletions(-)
> 
> diff --git a/arch/m68k/virt/platform.c b/arch/m68k/virt/platform.c
> index cb820f19a221..1560c4140ab9 100644
> --- a/arch/m68k/virt/platform.c
> +++ b/arch/m68k/virt/platform.c
> @@ -8,20 +8,15 @@
>   
>   #define VIRTIO_BUS_NB	128
>   
> -static int __init virt_virtio_init(unsigned int id)
> +static struct platform_device * __init virt_virtio_init(unsigned int id)
>   {
>   	const struct resource res[] = {
>   		DEFINE_RES_MEM(virt_bi_data.virtio.mmio + id * 0x200, 0x200),
>   		DEFINE_RES_IRQ(virt_bi_data.virtio.irq + id),
>   	};
> -	struct platform_device *pdev;
>   
> -	pdev = platform_device_register_simple("virtio-mmio", id,
> +	return platform_device_register_simple("virtio-mmio", id,
>   					       res, ARRAY_SIZE(res));
> -	if (IS_ERR(pdev))
> -		return PTR_ERR(pdev);
> -
> -	return 0;
>   }
>   
>   static int __init virt_platform_init(void)
> @@ -35,8 +30,10 @@ static int __init virt_platform_init(void)
>   		DEFINE_RES_MEM(virt_bi_data.rtc.mmio + 0x1000, 0x1000),
>   		DEFINE_RES_IRQ(virt_bi_data.rtc.irq + 1),
>   	};
> -	struct platform_device *pdev;
> +	struct platform_device *pdev1, *pdev2;
> +	struct platform_device *pdevs[VIRTIO_BUS_NB];
>   	unsigned int i;
> +	int ret = 0;
>   
>   	if (!MACH_IS_VIRT)
>   		return -ENODEV;
> @@ -44,29 +41,40 @@ static int __init virt_platform_init(void)
>   	/* We need this to have DMA'able memory provided to goldfish-tty */
>   	min_low_pfn = 0;
>   
> -	pdev = platform_device_register_simple("goldfish_tty",
> -					       PLATFORM_DEVID_NONE,
> -					       goldfish_tty_res,
> -					       ARRAY_SIZE(goldfish_tty_res));
> -	if (IS_ERR(pdev))
> -		return PTR_ERR(pdev);
> +	pdev1 = platform_device_register_simple("goldfish_tty",
> +						PLATFORM_DEVID_NONE,
> +						goldfish_tty_res,
> +						ARRAY_SIZE(goldfish_tty_res));
> +	if (IS_ERR(pdev1))
> +		return PTR_ERR(pdev1);
>   
> -	pdev = platform_device_register_simple("goldfish_rtc",
> -					       PLATFORM_DEVID_NONE,
> -					       goldfish_rtc_res,
> -					       ARRAY_SIZE(goldfish_rtc_res));
> -	if (IS_ERR(pdev))
> -		return PTR_ERR(pdev);
> +	pdev2 = platform_device_register_simple("goldfish_rtc",
> +						PLATFORM_DEVID_NONE,
> +						goldfish_rtc_res,
> +						ARRAY_SIZE(goldfish_rtc_res));
> +	if (IS_ERR(pdev2)) {
> +		ret = PTR_ERR(pdev2);
> +		goto err_unregister_tty;
> +	}
>   
>   	for (i = 0; i < VIRTIO_BUS_NB; i++) {
> -		int err;
> -
> -		err = virt_virtio_init(i);
> -		if (err)
> -			return err;
> +		pdevs[i] = virt_virtio_init(i);
> +		if (IS_ERR(pdevs[i])) {
> +			ret = PTR_ERR(pdevs[i]);
> +			goto err_unregister_rtc_virtio;
> +		}
>   	}
>   
>   	return 0;
> +
> +err_unregister_rtc_virtio:
> +	while (i > 0)
> +		platform_device_unregister(pdevs[--i]);
> +	platform_device_unregister(pdev2);
> +err_unregister_tty:
> +	platform_device_unregister(pdev1);
> +
> +	return ret;
>   }
>   
>   arch_initcall(virt_platform_init);

Reviewed-by: Laurent Vivier <laurent@...ier.eu>