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authorKevin D. Kissell <kevink@paralogos.com>2009-11-10 11:45:46 -0800
committerRalf Baechle <ralf@linux-mips.org>2009-11-13 18:10:38 +0100
commit5df9d11be46a9f704208644a1e7f13c6104ecff2 (patch)
tree9d60800fa2b9678c53fc78f3100821c20184e2c1 /arch/mips
parent1b12a9c87792550a3d7f5f39eb529c822b911b17 (diff)
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/mips')
-rw-r--r--arch/mips/kernel/cevt-smtc.c3
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