linux-kernel - Re: [PATCH] scsi: libiscsi: Convert timers to use timer

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Date:   Tue, 17 Oct 2017 13:11:49 -0400 (EDT)
From:   Chris Leech <cleech@...hat.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        Lee Duncan <lduncan@...e.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        open-iscsi@...glegroups.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: libiscsi: Convert timers to use timer_setup()


Reviewed-by: Chris Leech <cleech@...hat.com>

----- Original Message -----
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly.
> 
> Cc: Lee Duncan <lduncan@...e.com>
> Cc: Chris Leech <cleech@...hat.com>
> Cc: "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> Cc: open-iscsi@...glegroups.com
> Cc: linux-scsi@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/scsi/libiscsi.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
> index f8dc1601efd5..9c50d2d9f27c 100644
> --- a/drivers/scsi/libiscsi.c
> +++ b/drivers/scsi/libiscsi.c
> @@ -1805,9 +1805,9 @@ int iscsi_target_alloc(struct scsi_target *starget)
>  }
>  EXPORT_SYMBOL_GPL(iscsi_target_alloc);
>  
> -static void iscsi_tmf_timedout(unsigned long data)
> +static void iscsi_tmf_timedout(struct timer_list *t)
>  {
> -	struct iscsi_conn *conn = (struct iscsi_conn *)data;
> +	struct iscsi_conn *conn = from_timer(conn, t, tmf_timer);
>  	struct iscsi_session *session = conn->session;
>  
>  	spin_lock(&session->frwd_lock);
> @@ -1838,8 +1838,6 @@ static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
> *conn,
>  	}
>  	conn->tmfcmd_pdus_cnt++;
>  	conn->tmf_timer.expires = timeout * HZ + jiffies;
> -	conn->tmf_timer.function = iscsi_tmf_timedout;
> -	conn->tmf_timer.data = (unsigned long)conn;
>  	add_timer(&conn->tmf_timer);
>  	ISCSI_DBG_EH(session, "tmf set timeout\n");
>  
> @@ -2089,9 +2087,9 @@ enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct
> scsi_cmnd *sc)
>  }
>  EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
>  
> -static void iscsi_check_transport_timeouts(unsigned long data)
> +static void iscsi_check_transport_timeouts(struct timer_list *t)
>  {
> -	struct iscsi_conn *conn = (struct iscsi_conn *)data;
> +	struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
>  	struct iscsi_session *session = conn->session;
>  	unsigned long recv_timeout, next_timeout = 0, last_recv;
>  
> @@ -2913,9 +2911,7 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session,
> int dd_size,
>  	conn->exp_statsn = 0;
>  	conn->tmf_state = TMF_INITIAL;
>  
> -	init_timer(&conn->transport_timer);
> -	conn->transport_timer.data = (unsigned long)conn;
> -	conn->transport_timer.function = iscsi_check_transport_timeouts;
> +	timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
>  
>  	INIT_LIST_HEAD(&conn->mgmtqueue);
>  	INIT_LIST_HEAD(&conn->cmdqueue);
> @@ -2939,7 +2935,7 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session,
> int dd_size,
>  		goto login_task_data_alloc_fail;
>  	conn->login_task->data = conn->data = data;
>  
> -	init_timer(&conn->tmf_timer);
> +	timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0);
>  	init_waitqueue_head(&conn->ehwait);
>  
>  	return cls_conn;
> --
> 2.7.4
> 
> 
> --
> Kees Cook
> Pixel Security
>