linux-kernel - Re: [PATCH] io_uring: remove unnecessary NULL checks

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Date:   Tue, 18 Feb 2020 13:31:35 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        io-uring@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] io_uring: remove unnecessary NULL checks

On Mon, Feb 17, 2020 at 05:39:45PM +0300, Dan Carpenter wrote:
> The "kmsg" pointer can't be NULL and we have already dereferenced it so
> a check here would be useless.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
>  fs/io_uring.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 72bc378edebc..e9f339453ddb 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -3065,7 +3065,7 @@ static int io_sendmsg(struct io_kiocb *req, struct io_kiocb **nxt,
>  			if (req->io)
>  				return -EAGAIN;
>  			if (io_alloc_async_ctx(req)) {
> -				if (kmsg && kmsg->iov != kmsg->fast_iov)
> +				if (kmsg->iov != kmsg->fast_iov)
>  					kfree(kmsg->iov);
>  				return -ENOMEM;
>  			}
> @@ -3219,7 +3219,7 @@ static int io_recvmsg(struct io_kiocb *req, struct io_kiocb **nxt,
>  			if (req->io)
>  				return -EAGAIN;
>  			if (io_alloc_async_ctx(req)) {
> -				if (kmsg && kmsg->iov != kmsg->fast_iov)
> +				if (kmsg->iov != kmsg->fast_iov)
>  					kfree(kmsg->iov);
>  				return -ENOMEM;
>  			}

Make sense.

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

Thanks,
Stefano