linux-kernel - Re: [PATCH -next] ACPI: HMAT: Release platform device in case of platform_device_add

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Message-ID: <8d4a0893-c957-934c-7c6e-8c1c6028e2b7@huawei.com>
Date:   Mon, 26 Sep 2022 17:15:07 +0800
From:   "linyujun (C)" <linyujun809@...wei.com>
To:     <dan.j.williams@...el.com>, <vishal.l.verma@...el.com>,
        <dave.jiang@...el.com>, <joao.m.martins@...cle.com>,
        <akpm@...ux-foundation.org>
CC:     <nvdimm@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] ACPI: HMAT: Release platform device in case of
 platform_device_add_data() fails

kindly ping

在 2022/9/14 11:37, Lin Yujun 写道:
> The platform device is not released when platform_device_add_data()
> fails. And platform_device_put() perfom one more pointer check than
> put_device() to check for errors in the 'pdev' pointer.
>
> Use platform_device_put() to release platform device in
> platform_device_add()/platform_device_add_data()/
> platform_device_add_resources() error case.
>
> Fixes: c01044cc8191 ("ACPI: HMAT: refactor hmat_register_target_device to hmem_register_device")
> Signed-off-by: Lin Yujun <linyujun809@...wei.com>
> ---
>   drivers/dax/hmem/device.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dax/hmem/device.c b/drivers/dax/hmem/device.c
> index cb6401c9e9a4..f87ae005431a 100644
> --- a/drivers/dax/hmem/device.c
> +++ b/drivers/dax/hmem/device.c
> @@ -47,7 +47,7 @@ void hmem_register_device(int target_nid, struct resource *r)
>   	rc = platform_device_add_data(pdev, &info, sizeof(info));
>   	if (rc < 0) {
>   		pr_err("hmem memregion_info allocation failure for %pr\n", &res);
> -		goto out_pdev;
> +		goto out_resource;
>   	}
>   
>   	rc = platform_device_add_resources(pdev, &res, 1);
> @@ -65,7 +65,7 @@ void hmem_register_device(int target_nid, struct resource *r)
>   	return;
>   
>   out_resource:
> -	put_device(&pdev->dev);
> +	platform_device_put(pdev);
>   out_pdev:
>   	memregion_free(id);
>   }