diff options
| author | Clemens Ladisch <clemens@ladisch.de> | 2005-09-27 15:57:24 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2005-11-04 13:16:48 +0100 |
| commit | d9ad1bdd6d72606a59cdc07e571fbe695e32f271 (patch) | |
| tree | a5a702fc2db1e8079bad25b42d818e2f7636232f /sound/core/rtctimer.c | |
| parent | adf25df1be2e3843f786a2562202c7897bbd149d (diff) | |
[ALSA] rtctimer: optimize module parameter validation
Modules: RTC timer driver
The check whether rtctimer_freq is a power of two can be done easier
with a simple bit operation.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Diffstat (limited to 'sound/core/rtctimer.c')
| -rw-r--r-- | sound/core/rtctimer.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/sound/core/rtctimer.c b/sound/core/rtctimer.c index 85627dbe6a5..8762ff8938c 100644 --- a/sound/core/rtctimer.c +++ b/sound/core/rtctimer.c @@ -119,16 +119,11 @@ static void rtctimer_interrupt(void *private_data) */ static int __init rtctimer_init(void) { - int order, err; + int err; snd_timer_t *timer; - if (rtctimer_freq < 2 || rtctimer_freq > 8192) { - snd_printk(KERN_ERR "rtctimer: invalid frequency %d\n", rtctimer_freq); - return -EINVAL; - } - for (order = 1; rtctimer_freq > order; order <<= 1) - ; - if (rtctimer_freq != order) { + if (rtctimer_freq < 2 || rtctimer_freq > 8192 || + (rtctimer_freq & (rtctimer_freq - 1)) != 0) { snd_printk(KERN_ERR "rtctimer: invalid frequency %d\n", rtctimer_freq); return -EINVAL; } |