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| author | Ingo Molnar <mingo@elte.hu> | 2009-04-08 17:02:50 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-08 17:02:57 +0200 |
| commit | ff96e612cba32510e263e17b213235fe5746397e (patch) | |
| tree | a8df57d76b10e0901a4fb76cd2987eb9826a560a /drivers/char/hpet.c | |
| parent | futex: comment requeue key reference semantics (diff) | |
| parent | Linux 2.6.30-rc1 (diff) | |
| download | linux-ff96e612cba32510e263e17b213235fe5746397e.tar.xz linux-ff96e612cba32510e263e17b213235fe5746397e.zip | |
Merge commit 'v2.6.30-rc1' into core/urgent
Merge reason: need latest upstream to queue up dependent fix
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/char/hpet.c')
| -rw-r--r-- | drivers/char/hpet.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index 32b8bbf5003e..50dfa3bc71ce 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -713,7 +713,7 @@ static struct ctl_table_header *sysctl_header; */ #define TICK_CALIBRATE (1000UL) -static unsigned long hpet_calibrate(struct hpets *hpetp) +static unsigned long __hpet_calibrate(struct hpets *hpetp) { struct hpet_timer __iomem *timer = NULL; unsigned long t, m, count, i, flags, start; @@ -750,6 +750,26 @@ static unsigned long hpet_calibrate(struct hpets *hpetp) return (m - start) / i; } +static unsigned long hpet_calibrate(struct hpets *hpetp) +{ + unsigned long ret = -1; + unsigned long tmp; + + /* + * Try to calibrate until return value becomes stable small value. + * If SMI interruption occurs in calibration loop, the return value + * will be big. This avoids its impact. + */ + for ( ; ; ) { + tmp = __hpet_calibrate(hpetp); + if (ret <= tmp) + break; + ret = tmp; + } + + return ret; +} + int hpet_alloc(struct hpet_data *hdp) { u64 cap, mcfg; |