linux-kernel - Re: [PATCH] iscsi-target: Convert timers to use timer

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Message-ID: <CAHmME9pJRRhWg3=eorVkkSXhpsPgeCfRJFJp2i1-kdXr_E0PCA@mail.gmail.com>
Date:   Wed, 25 Oct 2017 14:41:43 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Nicholas Bellinger <nab@...ux-iscsi.org>,
        Jiang Yi <jiangyilism@...il.com>,
        Varun Prakash <varun@...lsio.com>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Al Viro <viro@...iv.linux.org.uk>, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iscsi-target: Convert timers to use timer_setup()

On Wed, Oct 25, 2017 at 12:01 PM, Kees Cook <keescook@...omium.org> wrote:
>         sess->time2retain_timer.expires =
>                 (get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ);
>         add_timer(&sess->time2retain_timer);
>         cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ);
>         add_timer(&cmd->dataout_timer);
>         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
>         add_timer(&np->np_login_timer);
> +       timeout.timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
> +       add_timer(&timeout.timer);
>         conn->nopin_response_timer.expires =
>                 (get_jiffies_64() + na->nopin_response_timeout * HZ);
>         add_timer(&conn->nopin_response_timer);
>         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
>         add_timer(&conn->nopin_timer);
>         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
>         add_timer(&conn->nopin_timer);

I assume you're trying to keep these diffs as small as possible, but I
imagine at some point the above can also be combined into a single
mod_timer.

Also, all the goofiness with the flags stuff seems like an antique
replacement for timer_pending:

>        conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
>        conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;