linux-kernel - Re: [PATCH] RDMA/core: Use fdget() and fdput()

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Date:   Fri, 5 May 2023 08:56:12 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     ye.xingchen@....com.cn
Cc:     leon@...nel.org, jiangjian@...rlc.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/core: Use fdget() and fdput()

On Fri, May 05, 2023 at 11:33:57AM +0800, ye.xingchen@....com.cn wrote:
> From: Ye Xingchen <ye.xingchen@....com.cn>
> 
> convert the fget()/fput() uses to fdget()/fdput().
> 
> Signed-off-by: Ye Xingchen <ye.xingchen@....com.cn>
> ---
>  drivers/infiniband/core/rdma_core.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
> index 29b1ab1d5f93..c35df0b27e86 100644
> --- a/drivers/infiniband/core/rdma_core.c
> +++ b/drivers/infiniband/core/rdma_core.c
> @@ -335,7 +335,7 @@ lookup_get_fd_uobject(const struct uverbs_api_object *obj,
>  		      enum rdma_lookup_mode mode)
>  {
>  	const struct uverbs_obj_fd_type *fd_type;
> -	struct file *f;
> +	struct fd f = fdget(fdno);
>  	struct ib_uobject *uobject;
>  	int fdno = id;
> 
> @@ -350,18 +350,17 @@ lookup_get_fd_uobject(const struct uverbs_api_object *obj,
>  	fd_type =
>  		container_of(obj->type_attrs, struct uverbs_obj_fd_type, type);
> 
> -	f = fget(fdno);
> -	if (!f)
> +	if (!f.file)
>  		return ERR_PTR(-EBADF);

This also has incorrect pairing with fdput

Jason