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| author | Kevin D. Kissell <kevink@paralogos.com> | 2009-11-10 11:45:46 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-11-13 18:10:38 +0100 |
| commit | 5df9d11be46a9f704208644a1e7f13c6104ecff2 (patch) | |
| tree | 9d60800fa2b9678c53fc78f3100821c20184e2c1 /arch | |
| parent | 1b12a9c87792550a3d7f5f39eb529c822b911b17 (diff) | |
| download | linux-3.10-5df9d11be46a9f704208644a1e7f13c6104ecff2.tar.gz linux-3.10-5df9d11be46a9f704208644a1e7f13c6104ecff2.tar.bz2 linux-3.10-5df9d11be46a9f704208644a1e7f13c6104ecff2.zip | |
MIPS: SMTC: Fix lockup in smtc_distribute_timer
1. At the end of smtc_distribute_timer, nextstamp is valid and has already
passed so we goto repeat.
2. Nothing updates nextstamp (only updated if the timeout is in the future
And we just decided it is in the past)
3. At the end nextstamp still has the same value so it is still valid and
in the past.
4. This repeats until read_c0_count has a value which causes nextstamp to
be in the future.
Reported and initial patch and testing by Mikael Starvik
<mikael.starvik@axis.com>.
Signed-off-by: Kevin D. Kissell <kevink@paralogos.com>
Cc: Mikael Starvik <mikael.starvik@axis.com>
Cc: linux-mips@linux-mips.org
Cc: Jesper Nilsson <Jesper.Nilsson@axis.com>
Patchwork: http://patchwork.linux-mips.org/patch/621/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/kernel/cevt-smtc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/mips/kernel/cevt-smtc.c b/arch/mips/kernel/cevt-smtc.c index 98bd7de7577..b102e4f1630 100644 --- a/arch/mips/kernel/cevt-smtc.c +++ b/arch/mips/kernel/cevt-smtc.c @@ -173,11 +173,12 @@ void smtc_distribute_timer(int vpe) unsigned int mtflags; int cpu; struct clock_event_device *cd; - unsigned long nextstamp = 0L; + unsigned long nextstamp; unsigned long reference; repeat: + nextstamp = 0L; for_each_online_cpu(cpu) { /* * Find virtual CPUs within the current VPE who have |