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Diffstat (limited to 'arch/powerpc/xmon/xmon.c')
-rw-r--r--arch/powerpc/xmon/xmon.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index a90731b3d44..b07909850f7 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -309,16 +309,23 @@ static void get_output_lock(void)
if (xmon_speaker == me)
return;
+
for (;;) {
- if (xmon_speaker == 0) {
- last_speaker = cmpxchg(&xmon_speaker, 0, me);
- if (last_speaker == 0)
- return;
- }
- timeout = 10000000;
+ last_speaker = cmpxchg(&xmon_speaker, 0, me);
+ if (last_speaker == 0)
+ return;
+
+ /*
+ * Wait a full second for the lock, we might be on a slow
+ * console, but check every 100us.
+ */
+ timeout = 10000;
while (xmon_speaker == last_speaker) {
- if (--timeout > 0)
+ if (--timeout > 0) {
+ udelay(100);
continue;
+ }
+
/* hostile takeover */
prev = cmpxchg(&xmon_speaker, last_speaker, me);
if (prev == last_speaker)
@@ -397,7 +404,6 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
}
xmon_fault_jmp[cpu] = recurse_jmp;
- cpumask_set_cpu(cpu, &cpus_in_xmon);
bp = NULL;
if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT))
@@ -419,6 +425,8 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
release_output_lock();
}
+ cpumask_set_cpu(cpu, &cpus_in_xmon);
+
waiting:
secondary = 1;
while (secondary && !xmon_gate) {