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authorJiri Kosina <jkosina@suse.cz>2007-11-28 16:22:03 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-29 09:24:54 -0800
commit8853c202b4a91713dbfb4d9b6e1c87cc2aa12392 (patch)
treea6c9621d3067eebc17c2ce53fa45e7513ee832a6 /include/linux
parent08b633070ad5fa17a837428a601c32cf3db6aafd (diff)
RTC: convert mutex to bitfield
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/rtc.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 6d5e4a46781..f2d0d152772 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -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;