[PATCH] Add msleep_interruptible() function to kernel/timer.c

Signed-off-by: Maximilian Attems <janitor@sternwelten.at>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 17 insertions, 0 deletions

diff --git a/include/linux/delay.h b/include/linux/delay.h
index d665e4b98711..5c43c336c849 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -39,6 +39,7 @@ extern unsigned long loops_per_jiffy;
 #endif
 
 void msleep(unsigned int msecs);
+unsigned long msleep_interruptible(unsigned int msecs);
 
 static inline void ssleep(unsigned int seconds)
 {
diff --git a/kernel/timer.c b/kernel/timer.c
index 29ecc04d8684..0f112148ae65 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1507,3 +1507,19 @@ void msleep(unsigned int msecs)
 
 EXPORT_SYMBOL(msleep);
 
+/**
+ * msleep_interruptible - sleep waiting for waitqueue interruptions
+ * @msecs: Time in milliseconds to sleep for
+ */
+unsigned long msleep_interruptible(unsigned int msecs)
+{
+       unsigned long timeout = msecs_to_jiffies(msecs);
+
+       while (timeout && !signal_pending(current)) {
+               set_current_state(TASK_INTERRUPTIBLE);
+               timeout = schedule_timeout(timeout);
+       }
+       return jiffies_to_msecs(timeout);
+}
+
+EXPORT_SYMBOL(msleep_interruptible);