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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2005-11-03 01:01:15 +0900
committerRalf Baechle <ralf@linux-mips.org>2005-11-07 18:05:38 +0000
commit53c2df2f4ebbc1d8231ca7cc13ac5381230888b1 (patch)
treea7446ec56dd877d77ef7318b4bcdc3d38555ff0a /arch/mips/ddb5xxx
parente329331aedeca0f2a7e15bd26a829ee1619c05e0 (diff)
downloadop-kernel-dev-53c2df2f4ebbc1d8231ca7cc13ac5381230888b1.zip
op-kernel-dev-53c2df2f4ebbc1d8231ca7cc13ac5381230888b1.tar.gz
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/ddb5xxx')
-rw-r--r--arch/mips/ddb5xxx/common/rtc_ds1386.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/mips/ddb5xxx/common/rtc_ds1386.c b/arch/mips/ddb5xxx/common/rtc_ds1386.c
index f5b1150..995896a 100644
--- a/arch/mips/ddb5xxx/common/rtc_ds1386.c
+++ b/arch/mips/ddb5xxx/common/rtc_ds1386.c
@@ -41,7 +41,9 @@ rtc_ds1386_get_time(void)
u8 byte;
u8 temp;
unsigned int year, month, day, hour, minute, second;
+ unsigned long flags;
+ spin_lock_irqsave(&rtc_lock, flags);
/* let us freeze external registers */
byte = READ_RTC(0xB);
byte &= 0x3f;
@@ -60,6 +62,7 @@ rtc_ds1386_get_time(void)
/* enable time transfer */
byte |= 0x80;
WRITE_RTC(0xB, byte);
+ spin_unlock_irqrestore(&rtc_lock, flags);
/* calc hour */
if (temp & 0x40) {
@@ -81,7 +84,9 @@ rtc_ds1386_set_time(unsigned long t)
u8 byte;
u8 temp;
u8 year, month, day, hour, minute, second;
+ unsigned long flags;
+ spin_lock_irqsave(&rtc_lock, flags);
/* let us freeze external registers */
byte = READ_RTC(0xB);
byte &= 0x3f;
@@ -133,6 +138,7 @@ rtc_ds1386_set_time(unsigned long t)
if (second != READ_RTC(0x1)) {
WRITE_RTC(0x1, second);
}
+ spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
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