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SubjectRe: [PATCH] dax/hmem: Fix refcount leak in dax_hmem_probe()
On Sat, Dec 03, 2022 at 09:58:58AM +0000, Yongqiang Liu wrote:
> We should always call dax_region_put() whenever devm_create_dev_dax()
> succeed or fail to avoid refcount leak of dax_region. Move the return
> value check after dax_region_put().

I think dax_region_put is called from dax_region_unregister() automatically on
tear down.

>
> Fixes: c01044cc8191 ("ACPI: HMAT: refactor hmat_register_target_device to hmem_register_device")

I'm also not sure how this patch is related to this fix.

Ira

> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
> ---
> drivers/dax/hmem/hmem.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
> index 1bf040dbc834..09f5cd7b6c8e 100644
> --- a/drivers/dax/hmem/hmem.c
> +++ b/drivers/dax/hmem/hmem.c
> @@ -36,12 +36,11 @@ static int dax_hmem_probe(struct platform_device *pdev)
> .size = region_idle ? 0 : resource_size(res),
> };
> dev_dax = devm_create_dev_dax(&data);
> - if (IS_ERR(dev_dax))
> - return PTR_ERR(dev_dax);
>
> /* child dev_dax instances now own the lifetime of the dax_region */
> dax_region_put(dax_region);
> - return 0;
> +
> + return IS_ERR(dev_dax) ? PTR_ERR(dev_dax) : 0;
> }
>
> static int dax_hmem_remove(struct platform_device *pdev)
> --
> 2.25.1
>
>

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