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Update some comments

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This commit is contained in:
Gregory Nutt
2016-11-23 17:40:01 -06:00
parent 7dbc25b02b
commit 7bec4ffeec
1 changed files with 14 additions and 13 deletions
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sched/irq/irq_csection.c
+6 -5
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@@ -112,10 +112,11 @@ static inline void irq_waitlock(int cpu)
while (up_testset(&g_cpu_irqlock) == SP_LOCKED) while (up_testset(&g_cpu_irqlock) == SP_LOCKED)
{ {
/* The deadlock condition would occur if CPUn: /* A deadlock condition would occur if CPUn:
* *
* 1. Holds the g_cpu_irqlock, and * 1. Holds the g_cpu_irqlock, and
* 2. Is trying to interrupt CPUm * 2. Is trying to interrupt CPUm, but
* 3. CPUm is spinning trying acquaire the g_cpu_irqlock.
* *
* The protocol for CPUn to pause CPUm is as follows * The protocol for CPUn to pause CPUm is as follows
* *
@@ -128,15 +129,15 @@ static inline void irq_waitlock(int cpu)
* interrupt handler. * interrupt handler.
* *
* The problem in the deadlock case is that CPUm cannot receive * The problem in the deadlock case is that CPUm cannot receive
* the interrupt because it is locked up spinning. He we break * the interrupt because it is locked up spinning. Here we break
* the deadlock here be handling the pause interrupt request * the deadlock here be handling the pause interrupt request
* while waiting. * while waiting.
*/ */
if (up_cpu_pausereq(cpu)) if (up_cpu_pausereq(cpu))
{ {
/* Yes.. some CPU is requesting to pause us! Handle the /* Yes.. some other CPU is requesting to pause this CPU! Handle
* pause interrupt now. * the pause interrupt now.
*/ */
DEBUGVERIFY(up_cpu_paused(cpu)); DEBUGVERIFY(up_cpu_paused(cpu));