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authorLinus Torvalds <torvalds@linux-foundation.org>2008-08-25 11:26:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-25 11:26:56 -0700
commit426e1eafdbd1d1349c852a2b90c7f20879d52ed2 (patch)
tree2c3043d8eef1bf34bf75ce002b380fcf6c5ce380
parentec73adba51b4dae11134f7e6ffc84feade9f15fa (diff)
parent38c052f8cff1bd323ccfa968136a9556652ee420 (diff)
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: rtc: fix deadlock
-rw-r--r--include/asm-generic/rtc.h12
1 files changed, 4 insertions, 8 deletions
diff --git a/include/asm-generic/rtc.h b/include/asm-generic/rtc.h
index be4af0029ac..71ef3f0b968 100644
--- a/include/asm-generic/rtc.h
+++ b/include/asm-generic/rtc.h
@@ -15,6 +15,7 @@
#include <linux/mc146818rtc.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
+#include <linux/delay.h>
#define RTC_PIE 0x40 /* periodic interrupt enable */
#define RTC_AIE 0x20 /* alarm interrupt enable */
@@ -43,7 +44,6 @@ static inline unsigned char rtc_is_updating(void)
static inline unsigned int get_rtc_time(struct rtc_time *time)
{
- unsigned long uip_watchdog = jiffies;
unsigned char ctrl;
unsigned long flags;
@@ -53,19 +53,15 @@ static inline unsigned int get_rtc_time(struct rtc_time *time)
/*
* read RTC once any update in progress is done. The update
- * can take just over 2ms. We wait 10 to 20ms. There is no need to
+ * can take just over 2ms. We wait 20ms. There is no need to
* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
* If you need to know *exactly* when a second has started, enable
* periodic update complete interrupts, (via ioctl) and then
* immediately read /dev/rtc which will block until you get the IRQ.
* Once the read clears, read the RTC time (again via ioctl). Easy.
*/
-
- if (rtc_is_updating() != 0)
- while (jiffies - uip_watchdog < 2*HZ/100) {
- barrier();
- cpu_relax();
- }
+ if (rtc_is_updating())
+ mdelay(20);
/*
* Only the values that we read from the RTC are set. We leave