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RTC: convert mutex to bitfield

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RTC code is using mutex to assure exclusive access to /dev/rtc.  This is
however wrong usage, as it leaves the mutex locked when returning into
userspace, which is unacceptable.

Convert rtc->char_lock into bit operation.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiri Kosina
2007-11-28 16:22:03 -08:00
committed by Linus Torvalds
parent 08b633070a
commit 8853c202b4
3 changed files with 10 additions and 11 deletions
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5
include/linux/rtc.h
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@@ -133,6 +133,9 @@ struct rtc_class_ops {
#define RTC_DEVICE_NAME_SIZE 20
struct rtc_task;
/* flags */
#define RTC_DEV_BUSY 0
struct rtc_device
{
struct device dev;
@@ -145,7 +148,7 @@ struct rtc_device
struct mutex ops_lock;
struct cdev char_dev;
struct mutex char_lock;
unsigned long flags;
unsigned long irq_data;
spinlock_t irq_lock;