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path: root/drivers/misc/cs5535-mfgpt.c
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Diffstat (limited to 'drivers/misc/cs5535-mfgpt.c')
-rw-r--r--drivers/misc/cs5535-mfgpt.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/misc/cs5535-mfgpt.c b/drivers/misc/cs5535-mfgpt.c
index 2d44b3300104..6f6218061b0d 100644
--- a/drivers/misc/cs5535-mfgpt.c
+++ b/drivers/misc/cs5535-mfgpt.c
@@ -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);