linux-kernel - Re: [PATCH] ksmbd: replace usage of found with dedicated list iterator variable

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Date:   Fri, 25 Mar 2022 15:58:13 +0900
From:   Hyunchul Lee <hyc.lee@...il.com>
To:     Jakob Koschel <jakobkoschel@...il.com>
Cc:     Namjae Jeon <linkinjeon@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steve French <sfrench@...ba.org>,
        linux-cifs <linux-cifs@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Brian Johannesmeyer <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>
Subject: Re: [PATCH] ksmbd: replace usage of found with dedicated list
 iterator variable

Reviewed-by: Hyunchul Lee <hyc.lee@...il.com>

2022년 3월 24일 (목) 오후 4:13, Jakob Koschel <jakobkoschel@...il.com>님이 작성:

>
> To move the list iterator variable into the list_for_each_entry_*()
> macro in the future it should be avoided to use the list iterator
> variable after the loop body.
>
> To *never* use the list iterator variable after the loop it was
> concluded to use a separate iterator variable instead of a
> found boolean [1].
>
> This removes the need to use a found variable and simply checking if
> the variable was set, can determine if the break/goto was hit.
>
> Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/
> Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
> ---
>  fs/ksmbd/smb2pdu.c | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
>
> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
> index 67e8e28e3fc3..be9606b9a944 100644
> --- a/fs/ksmbd/smb2pdu.c
> +++ b/fs/ksmbd/smb2pdu.c
> @@ -6618,8 +6618,7 @@ int smb2_cancel(struct ksmbd_work *work)
>         struct ksmbd_conn *conn = work->conn;
>         struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
>         struct smb2_hdr *chdr;
> -       struct ksmbd_work *cancel_work = NULL;
> -       int canceled = 0;
> +       struct ksmbd_work *cancel_work = NULL, *iter;
>         struct list_head *command_list;
>
>         ksmbd_debug(SMB, "smb2 cancel called on mid %llu, async flags 0x%x\n",
> @@ -6629,11 +6628,11 @@ int smb2_cancel(struct ksmbd_work *work)
>                 command_list = &conn->async_requests;
>
>                 spin_lock(&conn->request_lock);
> -               list_for_each_entry(cancel_work, command_list,
> +               list_for_each_entry(iter, command_list,
>                                     async_request_entry) {
> -                       chdr = smb2_get_msg(cancel_work->request_buf);
> +                       chdr = smb2_get_msg(iter->request_buf);
>
> -                       if (cancel_work->async_id !=
> +                       if (iter->async_id !=
>                             le64_to_cpu(hdr->Id.AsyncId))
>                                 continue;
>
> @@ -6641,7 +6640,7 @@ int smb2_cancel(struct ksmbd_work *work)
>                                     "smb2 with AsyncId %llu cancelled command = 0x%x\n",
>                                     le64_to_cpu(hdr->Id.AsyncId),
>                                     le16_to_cpu(chdr->Command));
> -                       canceled = 1;
> +                       cancel_work = iter;
>                         break;
>                 }
>                 spin_unlock(&conn->request_lock);
> @@ -6649,24 +6648,24 @@ int smb2_cancel(struct ksmbd_work *work)
>                 command_list = &conn->requests;
>
>                 spin_lock(&conn->request_lock);
> -               list_for_each_entry(cancel_work, command_list, request_entry) {
> -                       chdr = smb2_get_msg(cancel_work->request_buf);
> +               list_for_each_entry(iter, command_list, request_entry) {
> +                       chdr = smb2_get_msg(iter->request_buf);
>
>                         if (chdr->MessageId != hdr->MessageId ||
> -                           cancel_work == work)
> +                           iter == work)
>                                 continue;
>
>                         ksmbd_debug(SMB,
>                                     "smb2 with mid %llu cancelled command = 0x%x\n",
>                                     le64_to_cpu(hdr->MessageId),
>                                     le16_to_cpu(chdr->Command));
> -                       canceled = 1;
> +                       cancel_work = iter;
>                         break;
>                 }
>                 spin_unlock(&conn->request_lock);
>         }
>
> -       if (canceled) {
> +       if (cancel_work) {
>                 cancel_work->state = KSMBD_WORK_CANCELLED;
>                 if (cancel_work->cancel_fn)
>                         cancel_work->cancel_fn(cancel_work->cancel_argv);
>
> base-commit: f443e374ae131c168a065ea1748feac6b2e76613
> --
> 2.25.1
>


--
Thanks,
Hyunchul