diff options
| 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/momentum/ocelot_c/setup.c | |
| parent | e329331aedeca0f2a7e15bd26a829ee1619c05e0 (diff) | |
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/momentum/ocelot_c/setup.c')
| -rw-r--r-- | arch/mips/momentum/ocelot_c/setup.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/mips/momentum/ocelot_c/setup.c b/arch/mips/momentum/ocelot_c/setup.c index ce70fc96f16..2755c154747 100644 --- a/arch/mips/momentum/ocelot_c/setup.c +++ b/arch/mips/momentum/ocelot_c/setup.c @@ -140,7 +140,9 @@ unsigned long m48t37y_get_time(void) unsigned char* rtc_base = (unsigned char*)0xfc800000; #endif unsigned int year, month, day, hour, min, sec; + unsigned long flags; + spin_lock_irqsave(&rtc_lock, flags); /* stop the update */ rtc_base[0x7ff8] = 0x40; @@ -157,6 +159,7 @@ unsigned long m48t37y_get_time(void) /* start the update */ rtc_base[0x7ff8] = 0x00; + spin_unlock_irqrestore(&rtc_lock, flags); return mktime(year, month, day, hour, min, sec); } @@ -169,11 +172,13 @@ int m48t37y_set_time(unsigned long sec) unsigned char* rtc_base = (unsigned char*)0xfc800000; #endif struct rtc_time tm; + unsigned long flags; /* convert to a more useful format -- note months count from 0 */ to_tm(sec, &tm); tm.tm_mon += 1; + spin_lock_irqsave(&rtc_lock, flags); /* enable writing */ rtc_base[0x7ff8] = 0x80; @@ -197,6 +202,7 @@ int m48t37y_set_time(unsigned long sec) /* disable writing */ rtc_base[0x7ff8] = 0x00; + spin_unlock_irqrestore(&rtc_lock, flags); return 0; } |