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author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-25 11:26:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-25 11:26:56 -0700 |
commit | 426e1eafdbd1d1349c852a2b90c7f20879d52ed2 (patch) | |
tree | 2c3043d8eef1bf34bf75ce002b380fcf6c5ce380 | |
parent | ec73adba51b4dae11134f7e6ffc84feade9f15fa (diff) | |
parent | 38c052f8cff1bd323ccfa968136a9556652ee420 (diff) | |
download | linux-426e1eafdbd1d1349c852a2b90c7f20879d52ed2.tar.bz2 |
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.h | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/include/asm-generic/rtc.h b/include/asm-generic/rtc.h index be4af0029ac0..71ef3f0b9685 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 |