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cs5535-mfgpt: reuse timers that have never been set up 

The MFGPT hardware may be set up only once, therefore
cs5535_mfgpt_free_timer() didn't re-set the timer's "avail" bit.  However
if a timer is freed before it has actually been in use then it may be made
available again.

Signed-off-by: Jens Rottmann <JRottmann@LiPPERTEmbedded.de>
Acked-by: Andres Salomon <dilinger@queued.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jens Rottmann 2010-08-10 18:03:12 -07:00 committed by Linus Torvalds
parent e73790a57a
commit ecd6269174
1 changed files with 11 additions and 0 deletions
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11
drivers/misc/cs5535-mfgpt.c
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@ -211,6 +211,17 @@ EXPORT_SYMBOL_GPL(cs5535_mfgpt_alloc_timer);
*/
void cs5535_mfgpt_free_timer(struct cs5535_mfgpt_timer *timer)
{
unsigned long flags;
uint16_t val;
/* timer can be made available again only if never set up */
val = cs5535_mfgpt_read(timer, MFGPT_REG_SETUP);
if (!(val & MFGPT_SETUP_SETUP)) {
spin_lock_irqsave(&timer->chip->lock, flags);
__set_bit(timer->nr, timer->chip->avail);
spin_unlock_irqrestore(&timer->chip->lock, flags);
}
kfree(timer);
}
EXPORT_SYMBOL_GPL(cs5535_mfgpt_free_timer);