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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-11-01 19:11:03 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-11-05 17:06:21 +1100 |
| commit | 978d7eb31d44de34a7f71e04ed4158f3f854688d (patch) | |
| tree | aed6b90715df7b2f44a69ac948a0af70a4427143 /arch | |
| parent | f1167fb318f0ff0bcb9cbb57bb6d16ad450f0cfb (diff) | |
| download | linux-978d7eb31d44de34a7f71e04ed4158f3f854688d.tar.gz linux-978d7eb31d44de34a7f71e04ed4158f3f854688d.tar.bz2 linux-978d7eb31d44de34a7f71e04ed4158f3f854688d.zip | |
powerpc: Avoid giving out RTC dates below EPOCH
Doing so causes xtime to be negative which crashes the timekeeping
code in funny ways when doing suspend/resume
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 92dc844299b6..a136a11c490d 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -777,7 +777,7 @@ int update_persistent_clock(struct timespec now) return ppc_md.set_rtc_time(&tm); } -void read_persistent_clock(struct timespec *ts) +static void __read_persistent_clock(struct timespec *ts) { struct rtc_time tm; static int first = 1; @@ -800,10 +800,23 @@ void read_persistent_clock(struct timespec *ts) return; } ppc_md.get_rtc_time(&tm); + ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec); } +void read_persistent_clock(struct timespec *ts) +{ + __read_persistent_clock(ts); + + /* Sanitize it in case real time clock is set below EPOCH */ + if (ts->tv_sec < 0) { + ts->tv_sec = 0; + ts->tv_nsec = 0; + } + +} + /* clocksource code */ static cycle_t rtc_read(struct clocksource *cs) { |