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Date:   Wed, 25 Oct 2017 11:21:29 -0500 (CDT)
From:   Mike Isely <isely@...ly.net>
To:     Kees Cook <keescook@...omium.org>
cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mike Isely at pobox <isely@...ox.com>
Subject: Re: [PATCH] media: pvrusb2: Convert timers to use timer_setup()


Acked-By: Mike Isely <isely@...ox.com>

On Tue, 24 Oct 2017, Kees Cook wrote:

> 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: Mike Isely <isely@...ox.com>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: linux-media@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 64 ++++++++++++++++++---------------
>  1 file changed, 36 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> index ad5b25b89699..8289ee482f49 100644
> --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> @@ -330,10 +330,10 @@ static void pvr2_hdw_state_log_state(struct pvr2_hdw *);
>  static int pvr2_hdw_cmd_usbstream(struct pvr2_hdw *hdw,int runFl);
>  static int pvr2_hdw_commit_setup(struct pvr2_hdw *hdw);
>  static int pvr2_hdw_get_eeprom_addr(struct pvr2_hdw *hdw);
> -static void pvr2_hdw_quiescent_timeout(unsigned long);
> -static void pvr2_hdw_decoder_stabilization_timeout(unsigned long);
> -static void pvr2_hdw_encoder_wait_timeout(unsigned long);
> -static void pvr2_hdw_encoder_run_timeout(unsigned long);
> +static void pvr2_hdw_quiescent_timeout(struct timer_list *);
> +static void pvr2_hdw_decoder_stabilization_timeout(struct timer_list *);
> +static void pvr2_hdw_encoder_wait_timeout(struct timer_list *);
> +static void pvr2_hdw_encoder_run_timeout(struct timer_list *);
>  static int pvr2_issue_simple_cmd(struct pvr2_hdw *,u32);
>  static int pvr2_send_request_ex(struct pvr2_hdw *hdw,
>  				unsigned int timeout,int probe_fl,
> @@ -2373,18 +2373,15 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
>  	}
>  	if (!hdw) goto fail;
>  
> -	setup_timer(&hdw->quiescent_timer, pvr2_hdw_quiescent_timeout,
> -		    (unsigned long)hdw);
> +	timer_setup(&hdw->quiescent_timer, pvr2_hdw_quiescent_timeout, 0);
>  
> -	setup_timer(&hdw->decoder_stabilization_timer,
> -		    pvr2_hdw_decoder_stabilization_timeout,
> -		    (unsigned long)hdw);
> +	timer_setup(&hdw->decoder_stabilization_timer,
> +		    pvr2_hdw_decoder_stabilization_timeout, 0);
>  
> -	setup_timer(&hdw->encoder_wait_timer, pvr2_hdw_encoder_wait_timeout,
> -		    (unsigned long)hdw);
> +	timer_setup(&hdw->encoder_wait_timer, pvr2_hdw_encoder_wait_timeout,
> +		    0);
>  
> -	setup_timer(&hdw->encoder_run_timer, pvr2_hdw_encoder_run_timeout,
> -		    (unsigned long)hdw);
> +	timer_setup(&hdw->encoder_run_timer, pvr2_hdw_encoder_run_timeout, 0);
>  
>  	hdw->master_state = PVR2_STATE_DEAD;
>  
> @@ -3539,10 +3536,16 @@ static void pvr2_ctl_read_complete(struct urb *urb)
>  	complete(&hdw->ctl_done);
>  }
>  
> +struct hdw_timer {
> +	struct timer_list timer;
> +	struct pvr2_hdw *hdw;
> +};
>  
> -static void pvr2_ctl_timeout(unsigned long data)
> +static void pvr2_ctl_timeout(struct timer_list *t)
>  {
> -	struct pvr2_hdw *hdw = (struct pvr2_hdw *)data;
> +	struct hdw_timer *timer = from_timer(timer, t, timer);
> +	struct pvr2_hdw *hdw = timer->hdw;
> +
>  	if (hdw->ctl_write_pend_flag || hdw->ctl_read_pend_flag) {
>  		hdw->ctl_timeout_flag = !0;
>  		if (hdw->ctl_write_pend_flag)
> @@ -3564,7 +3567,10 @@ static int pvr2_send_request_ex(struct pvr2_hdw *hdw,
>  {
>  	unsigned int idx;
>  	int status = 0;
> -	struct timer_list timer;
> +	struct hdw_timer timer = {
> +		.hdw = hdw,
> +	};
> +
>  	if (!hdw->ctl_lock_held) {
>  		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
>  			   "Attempted to execute control transfer without lock!!");
> @@ -3621,8 +3627,8 @@ static int pvr2_send_request_ex(struct pvr2_hdw *hdw,
>  	hdw->ctl_timeout_flag = 0;
>  	hdw->ctl_write_pend_flag = 0;
>  	hdw->ctl_read_pend_flag = 0;
> -	setup_timer(&timer, pvr2_ctl_timeout, (unsigned long)hdw);
> -	timer.expires = jiffies + timeout;
> +	timer_setup_on_stack(&timer.timer, pvr2_ctl_timeout, 0);
> +	timer.timer.expires = jiffies + timeout;
>  
>  	if (write_len && write_data) {
>  		hdw->cmd_debug_state = 2;
> @@ -3677,7 +3683,7 @@ status);
>  	}
>  
>  	/* Start timer */
> -	add_timer(&timer);
> +	add_timer(&timer.timer);
>  
>  	/* Now wait for all I/O to complete */
>  	hdw->cmd_debug_state = 4;
> @@ -3687,7 +3693,7 @@ status);
>  	hdw->cmd_debug_state = 5;
>  
>  	/* Stop timer */
> -	del_timer_sync(&timer);
> +	del_timer_sync(&timer.timer);
>  
>  	hdw->cmd_debug_state = 6;
>  	status = 0;
> @@ -3769,6 +3775,8 @@ status);
>  	if ((status < 0) && (!probe_fl)) {
>  		pvr2_hdw_render_useless(hdw);
>  	}
> +	destroy_timer_on_stack(&timer.timer);
> +
>  	return status;
>  }
>  
> @@ -4366,9 +4374,9 @@ static int state_eval_encoder_run(struct pvr2_hdw *hdw)
>  
>  
>  /* Timeout function for quiescent timer. */
> -static void pvr2_hdw_quiescent_timeout(unsigned long data)
> +static void pvr2_hdw_quiescent_timeout(struct timer_list *t)
>  {
> -	struct pvr2_hdw *hdw = (struct pvr2_hdw *)data;
> +	struct pvr2_hdw *hdw = from_timer(hdw, t, quiescent_timer);
>  	hdw->state_decoder_quiescent = !0;
>  	trace_stbit("state_decoder_quiescent",hdw->state_decoder_quiescent);
>  	hdw->state_stale = !0;
> @@ -4377,9 +4385,9 @@ static void pvr2_hdw_quiescent_timeout(unsigned long data)
>  
>  
>  /* Timeout function for decoder stabilization timer. */
> -static void pvr2_hdw_decoder_stabilization_timeout(unsigned long data)
> +static void pvr2_hdw_decoder_stabilization_timeout(struct timer_list *t)
>  {
> -	struct pvr2_hdw *hdw = (struct pvr2_hdw *)data;
> +	struct pvr2_hdw *hdw = from_timer(hdw, t, decoder_stabilization_timer);
>  	hdw->state_decoder_ready = !0;
>  	trace_stbit("state_decoder_ready", hdw->state_decoder_ready);
>  	hdw->state_stale = !0;
> @@ -4388,9 +4396,9 @@ static void pvr2_hdw_decoder_stabilization_timeout(unsigned long data)
>  
>  
>  /* Timeout function for encoder wait timer. */
> -static void pvr2_hdw_encoder_wait_timeout(unsigned long data)
> +static void pvr2_hdw_encoder_wait_timeout(struct timer_list *t)
>  {
> -	struct pvr2_hdw *hdw = (struct pvr2_hdw *)data;
> +	struct pvr2_hdw *hdw = from_timer(hdw, t, encoder_wait_timer);
>  	hdw->state_encoder_waitok = !0;
>  	trace_stbit("state_encoder_waitok",hdw->state_encoder_waitok);
>  	hdw->state_stale = !0;
> @@ -4399,9 +4407,9 @@ static void pvr2_hdw_encoder_wait_timeout(unsigned long data)
>  
>  
>  /* Timeout function for encoder run timer. */
> -static void pvr2_hdw_encoder_run_timeout(unsigned long data)
> +static void pvr2_hdw_encoder_run_timeout(struct timer_list *t)
>  {
> -	struct pvr2_hdw *hdw = (struct pvr2_hdw *)data;
> +	struct pvr2_hdw *hdw = from_timer(hdw, t, encoder_run_timer);
>  	if (!hdw->state_encoder_runok) {
>  		hdw->state_encoder_runok = !0;
>  		trace_stbit("state_encoder_runok",hdw->state_encoder_runok);
> 

-- 

Mike Isely
isely @ isely (dot) net
PGP: 03 54 43 4D 75 E5 CC 92 71 16 01 E2 B5 F5 C1 E8

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