From eafe8404c103b3051b6421fc17e0e8b91d369f0b Mon Sep 17 00:00:00 2001 From: Tina Ruchandani Date: Wed, 29 Oct 2014 10:48:10 -0700 Subject: [PATCH] ALSA: es1968: Replace timeval with ktime_t es1968_measure_clock uses struct timeval, which on 32-bit systems will overflow in 2038, leading to incorrect interpretation of time.This patch changes the function to use ktime_t instead of struct timeval, which implies: - no y2038: ktime_t uses a 64-bit datatype explicitly. - efficent subtraction: The earlier version computes the difference in usecs while dealing with secs and nsecs. It requires checks to see if the nsecs of stop is less than start. This patch uses a direct subtract of ktime_t and converts to usecs. - use of monotonic clock (ktime_get) over real time (do_gettimeofday), which simplifies timekeeping, as it does not have to deal with cases where stop_time is less than start_time. Signed-off-by: Tina Ruchandani Reviewed-by: Arnd Bergmann Signed-off-by: Takashi Iwai --- sound/pci/es1968.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c index a9956a7c5677..6039700f8579 100644 --- a/sound/pci/es1968.c +++ b/sound/pci/es1968.c @@ -1710,7 +1710,8 @@ static void es1968_measure_clock(struct es1968 *chip) int i, apu; unsigned int pa, offset, t; struct esm_memory *memory; - struct timeval start_time, stop_time; + ktime_t start_time, stop_time; + ktime_t diff; if (chip->clock == 0) chip->clock = 48000; /* default clock value */ @@ -1761,12 +1762,12 @@ static void es1968_measure_clock(struct es1968 *chip) snd_es1968_bob_inc(chip, ESM_BOB_FREQ); __apu_set_register(chip, apu, 5, pa & 0xffff); snd_es1968_trigger_apu(chip, apu, ESM_APU_16BITLINEAR); - do_gettimeofday(&start_time); + start_time = ktime_get(); spin_unlock_irq(&chip->reg_lock); msleep(50); spin_lock_irq(&chip->reg_lock); offset = __apu_get_register(chip, apu, 5); - do_gettimeofday(&stop_time); + stop_time = ktime_get(); snd_es1968_trigger_apu(chip, apu, 0); /* stop */ snd_es1968_bob_dec(chip); chip->in_measurement = 0; @@ -1777,12 +1778,8 @@ static void es1968_measure_clock(struct es1968 *chip) offset &= 0xfffe; offset += chip->measure_count * (CLOCK_MEASURE_BUFSIZE/2); - t = stop_time.tv_sec - start_time.tv_sec; - t *= 1000000; - if (stop_time.tv_usec < start_time.tv_usec) - t -= start_time.tv_usec - stop_time.tv_usec; - else - t += stop_time.tv_usec - start_time.tv_usec; + diff = ktime_sub(stop_time, start_time); + t = ktime_to_us(diff); if (t == 0) { dev_err(chip->card->dev, "?? calculation error..\n"); } else { -- 2.20.1