linux-kernel - Re: [PATCH] ARM: pxa: Fix error handling in viper_tpm

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Date:   Mon, 27 Dec 2021 16:34:51 +0100
From:   Daniel Mack <daniel@...que.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Russell King <linux@...linux.org.uk>,
        Marc Zyngier <marc.zyngier@...ran.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: pxa: Fix error handling in viper_tpm_init

Hi,

On 27/12/2021 13:51, Miaoqian Lin wrote:
> tpm_device get by platform_device_alloc(), which calls device_initialize.
> Call platform_device_put(tpm_device) instead of kfree(tmp_device) to
> prevent memory leak.

While this seems correct, I don't think we should make any effort to 
maintain legacy board support files but rather move to DTS instead. 
Robert and I laid the foundation and ported a few machines a while ago, 
but I was reluctant to touch the board support code I can't test on real 
hardware.

As you seem to have access to a Viper board, could you have a look at 
the existing device-tree ported PXA machines and see if you can follow 
suit here please?


Thanks,
Daniel


> 
> Fixes: 352699a ("Basic support for the Arcom/Eurotech Viper SBC.")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>   arch/arm/mach-pxa/viper.c | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/mach-pxa/viper.c b/arch/arm/mach-pxa/viper.c
> index 3aa34e9a15d3..9a0f184dbecb 100644
> --- a/arch/arm/mach-pxa/viper.c
> +++ b/arch/arm/mach-pxa/viper.c
> @@ -815,11 +815,11 @@ static void __init viper_tpm_init(void)
>   					      sizeof(i2c_tpm_data))) {
>   			if (platform_device_add(tpm_device)) {
>   				errstr = "register TPM i2c bus";
> -				goto error_free_tpm;
> +				goto exit_put_device;
>   			}
>   		} else {
>   			errstr = "allocate TPM i2c bus data";
> -			goto error_free_tpm;
> +			goto exit_put_device;
>   		}
>   	} else {
>   		errstr = "allocate TPM i2c device";
> @@ -827,9 +827,8 @@ static void __init viper_tpm_init(void)
>   	}
>   
>   	return;
> -
> -error_free_tpm:
> -	kfree(tpm_device);
> +exit_put_device:
> +	platform_device_put(tpm_device);
>   error_tpm:
>   	pr_err("viper: Couldn't %s, giving up\n", errstr);
>   }