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| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2005-11-03 01:01:15 +0900 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2005-11-07 18:05:38 +0000 |
| commit | 53c2df2f4ebbc1d8231ca7cc13ac5381230888b1 (patch) | |
| tree | a7446ec56dd877d77ef7318b4bcdc3d38555ff0a /arch/mips/sgi-ip22/ip22-time.c | |
| parent | e329331aedeca0f2a7e15bd26a829ee1619c05e0 (diff) | |
| download | linux-53c2df2f4ebbc1d8231ca7cc13ac5381230888b1.tar.gz linux-53c2df2f4ebbc1d8231ca7cc13ac5381230888b1.tar.bz2 linux-53c2df2f4ebbc1d8231ca7cc13ac5381230888b1.zip | |
Use rtc_lock to protect RTC operations
Many RTC routines were not protected against each other, so there are
potential races, for example, ntp-update against /dev/rtc. This patch
fixes them using rtc_lock.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/sgi-ip22/ip22-time.c')
| -rw-r--r-- | arch/mips/sgi-ip22/ip22-time.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip22/ip22-time.c b/arch/mips/sgi-ip22/ip22-time.c index df9b5694328a..b7300cc5c5ad 100644 --- a/arch/mips/sgi-ip22/ip22-time.c +++ b/arch/mips/sgi-ip22/ip22-time.c @@ -35,7 +35,9 @@ static unsigned long indy_rtc_get_time(void) { unsigned int yrs, mon, day, hrs, min, sec; unsigned int save_control; + unsigned long flags; + spin_lock_irqsave(&rtc_lock, flags); save_control = hpc3c0->rtcregs[RTC_CMD] & 0xff; hpc3c0->rtcregs[RTC_CMD] = save_control | RTC_TE; @@ -47,6 +49,7 @@ static unsigned long indy_rtc_get_time(void) yrs = BCD2BIN(hpc3c0->rtcregs[RTC_YEAR] & 0xff); hpc3c0->rtcregs[RTC_CMD] = save_control; + spin_unlock_irqrestore(&rtc_lock, flags); if (yrs < 45) yrs += 30; @@ -60,6 +63,7 @@ static int indy_rtc_set_time(unsigned long tim) { struct rtc_time tm; unsigned int save_control; + unsigned long flags; to_tm(tim, &tm); @@ -68,6 +72,7 @@ static int indy_rtc_set_time(unsigned long tim) if (tm.tm_year >= 100) tm.tm_year -= 100; + spin_lock_irqsave(&rtc_lock, flags); save_control = hpc3c0->rtcregs[RTC_CMD] & 0xff; hpc3c0->rtcregs[RTC_CMD] = save_control | RTC_TE; @@ -80,6 +85,7 @@ static int indy_rtc_set_time(unsigned long tim) hpc3c0->rtcregs[RTC_HUNDREDTH_SECOND] = 0; hpc3c0->rtcregs[RTC_CMD] = save_control; + spin_unlock_irqrestore(&rtc_lock, flags); return 0; } |