sound: Use hrtimer_resolution instead of hrtimer_get_res()

No point in converting a timespec now that the value is directly
accessible. Get rid of the null check while at it. Resolution is
guaranteed to be > 0.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: alsa-devel@alsa-project.org
Link: http://lkml.kernel.org/r/20150414203500.799133359@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 7 insertions, 17 deletions

diff --git a/sound/core/hrtimer.c b/sound/core/hrtimer.c
index 886be7da989d..f845ecf7e172 100644
--- a/sound/core/hrtimer.c
+++ b/sound/core/hrtimer.c
@@ -121,16 +121,9 @@ static struct snd_timer *mytimer;
 static int __init snd_hrtimer_init(void)
 {
         struct snd_timer *timer;
-        struct timespec tp;
         int err;
 
-        hrtimer_get_res(CLOCK_MONOTONIC, &tp);
-        if (tp.tv_sec > 0 || !tp.tv_nsec) {
-                pr_err("snd-hrtimer: Invalid resolution %u.%09u",
-                           (unsigned)tp.tv_sec, (unsigned)tp.tv_nsec);
-                return -EINVAL;
-        }
-        resolution = tp.tv_nsec;
+        resolution = hrtimer_resolution;
 
         /* Create a new timer and set up the fields */
         err = snd_timer_global_new("hrtimer", SNDRV_TIMER_GLOBAL_HRTIMER,
diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
index d9647bd84d0f..eb54702037cc 100644
--- a/sound/drivers/pcsp/pcsp.c
+++ b/sound/drivers/pcsp/pcsp.c
@@ -42,16 +42,13 @@ struct snd_pcsp pcsp_chip;
 static int snd_pcsp_create(struct snd_card *card)
 {
         static struct snd_device_ops ops = { };
-        struct timespec tp;
-        int err;
-        int div, min_div, order;
-
-        hrtimer_get_res(CLOCK_MONOTONIC, &tp);
+        unsigned int resolution = hrtimer_resolution;
+        int err, div, min_div, order;
 
         if (!nopcm) {
-                if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
+                if (resolution > PCSP_MAX_PERIOD_NS) {
                         printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
-                                "(%linS)\n", tp.tv_nsec);
+                                "(%linS)\n", resolution);
                         printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
                                 "enabled.\n");
                         printk(KERN_ERR "PCSP: Turned into nopcm mode.\n");
@@ -59,13 +56,13 @@ static int snd_pcsp_create(struct snd_card *card)
                 }
         }
 
-        if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
+        if (loops_per_jiffy >= PCSP_MIN_LPJ && resolution <= PCSP_MIN_PERIOD_NS)
                 min_div = MIN_DIV;
         else
                 min_div = MAX_DIV;
 #if PCSP_DEBUG
         printk(KERN_DEBUG "PCSP: lpj=%li, min_div=%i, res=%li\n",
-               loops_per_jiffy, min_div, tp.tv_nsec);
+               loops_per_jiffy, min_div, resolution);
 #endif
 
         div = MAX_DIV / min_div;