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Use rtc_lock to protect RTC operations

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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>
This commit is contained in:
Atsushi Nemoto
2005-11-03 01:01:15 +09:00
committed by Ralf Baechle
parent e329331aed
commit 53c2df2f4e
13 changed files with 111 additions and 4 deletions
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9
arch/mips/lasat/ds1603.c
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@@ -8,6 +8,7 @@
#include <asm/lasat/lasat.h>
#include <linux/delay.h>
#include <asm/lasat/ds1603.h>
#include <asm/time.h>
#include "ds1603.h"
@@ -138,19 +139,27 @@ static void rtc_end_op(void)
unsigned long ds1603_read(void)
{
unsigned long word;
unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
rtc_init_op();
rtc_write_byte(READ_TIME_CMD);
word = rtc_read_word();
rtc_end_op();
spin_unlock_irqrestore(&rtc_lock, flags);
return word;
}
int ds1603_set(unsigned long time)
{
unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
rtc_init_op();
rtc_write_byte(SET_TIME_CMD);
rtc_write_word(time);
rtc_end_op();
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}