Char: ds1286, eliminate busy waiting

ds1286_get_time(); is not called from atomic context, sleep for 20 ms is
better choice than a (home-made) busy waiting for such a situation.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/char/ds1286.c b/drivers/char/ds1286.c
index fb584938c9c3..5329d482b582 100644
--- a/drivers/char/ds1286.c
+++ b/drivers/char/ds1286.c
@@ -443,7 +443,6 @@ static void ds1286_get_time(struct rtc_time *rtc_tm)
 {
         unsigned char save_control;
         unsigned long flags;
-        unsigned long uip_watchdog = jiffies;
 
         /*
          * read RTC once any update in progress is done. The update
@@ -456,8 +455,7 @@ static void ds1286_get_time(struct rtc_time *rtc_tm)
          */
 
         if (ds1286_is_updating() != 0)
-                while (time_before(jiffies, uip_watchdog + 2*HZ/100))
-                        barrier();
+                msleep(20);
 
         /*
          * Only the values that we read from the RTC are set. We leave