Re: [PATCH v2] complib/cl_timer.c: fixing cl_timer calculation

[Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org>]

On 16:21 Tue 24 Aug     , Yevgeny Kliteynik wrote:
> When calculating p_timer->timeout.tv_sec and p_timer->timeout.tv_nsec,
> the carry was ignored, resulting in wrong value in p_timer->timeout.tv_sec,
> and value > 10^9 in p_timer->timeout.tv_nsec (illegal value).
> 
> Signed-off-by: Yevgeny Kliteynik <kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>

Applied. Thanks.

Tiny comment is below.

> ---
> 
> V2: - using macros instead of int types
>     - fixed the same problem in cl_timer_trim()
> 
>  opensm/complib/cl_timer.c |   48 ++++++++++++++++++++++----------------------
>  1 files changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/opensm/complib/cl_timer.c b/opensm/complib/cl_timer.c
> index 2acdb51..3b3c7b0 100644
> --- a/opensm/complib/cl_timer.c
> +++ b/opensm/complib/cl_timer.c
> @@ -294,12 +294,32 @@ static cl_status_t __cl_timer_find(IN const cl_list_item_t * const p_list_item,
>  	return (CL_NOT_FOUND);
>  }
> 
> +/*
> + * Calculate 'struct timespec' value that is the
> + * current time plus the 'time_ms' milliseconds.
> + */
> +static __inline void __cl_timer_calculate(IN const uint32_t time_ms,
> +					  OUT struct timespec * const p_timer)
> +{
> +	struct timeval curtime, deltatime, endtime;
> +
> +#ifndef timerclear
> +#define timerclear(tvp)  (tvp)->tv_sec = (time_t)0, (tvp)->tv_usec = 0L
> +#endif
> +	timerclear(&curtime);
> +	gettimeofday(&curtime, NULL);

I don't think that curtime initialization does something useful before
gettimeofday() call.

Sasha

> +
> +	deltatime.tv_sec = time_ms / 1000;
> +	deltatime.tv_usec = (time_ms % 1000) * 1000;
> +	timeradd(&curtime, &deltatime, &endtime);
> +	p_timer->tv_sec = endtime.tv_sec;
> +	p_timer->tv_nsec = endtime.tv_usec * 1000;
> +}
> +
>  cl_status_t cl_timer_start(IN cl_timer_t * const p_timer,
>  			   IN const uint32_t time_ms)
>  {
> -	struct timeval curtime;
>  	cl_list_item_t *p_list_item;
> -	uint32_t delta_time = time_ms;
> 
>  	CL_ASSERT(p_timer);
>  	CL_ASSERT(p_timer->state == CL_INITIALIZED);
> @@ -313,20 +333,7 @@ cl_status_t cl_timer_start(IN cl_timer_t * const p_timer,
>  		cl_qlist_remove_item(&gp_timer_prov->queue,
>  				     &p_timer->list_item);
> 
> -	/* Get the current time */
> -#ifndef timerclear
> -#define	timerclear(tvp)		(tvp)->tv_sec = (time_t)0, (tvp)->tv_usec = 0L
> -#endif
> -	timerclear(&curtime);
> -	gettimeofday(&curtime, NULL);
> -
> -	/* do not do 0 wait ! */
> -	/* if (delta_time < 1000.0) {delta_time = 1000;} */
> -
> -	/* Calculate the timeout. */
> -	p_timer->timeout.tv_sec = curtime.tv_sec + (delta_time / 1000);
> -	p_timer->timeout.tv_nsec =
> -	    (curtime.tv_usec + ((delta_time % 1000) * 1000)) * 1000;
> +	__cl_timer_calculate(time_ms, &p_timer->timeout);
> 
>  	/* Add the timer to the queue. */
>  	if (cl_is_qlist_empty(&gp_timer_prov->queue)) {
> @@ -385,7 +392,6 @@ void cl_timer_stop(IN cl_timer_t * const p_timer)
>  cl_status_t cl_timer_trim(IN cl_timer_t * const p_timer,
>  			  IN const uint32_t time_ms)
>  {
> -	struct timeval curtime;
>  	struct timespec newtime;
>  	cl_status_t status;
> 
> @@ -394,13 +400,7 @@ cl_status_t cl_timer_trim(IN cl_timer_t * const p_timer,
> 
>  	pthread_mutex_lock(&gp_timer_prov->mutex);
> 
> -	/* Get the current time */
> -	timerclear(&curtime);
> -	gettimeofday(&curtime, NULL);
> -
> -	/* Calculate the timeout. */
> -	newtime.tv_sec = curtime.tv_sec + (time_ms / 1000);
> -	newtime.tv_nsec = (curtime.tv_usec + ((time_ms % 1000) * 1000)) * 1000;
> +	__cl_timer_calculate(time_ms, &newtime);
> 
>  	if (p_timer->timer_state == CL_TIMER_QUEUED) {
>  		/* If the old time is earlier, do not trim it.  Just return. */
> -- 
> 1.6.2.4
> 
> 
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