From: Todd Poynor <[email protected]> Currently when a pending wakeup irq stops suspend, it can be difficult to determine why suspend was prevented and which IRQ was actually responsible.
In order to help debug these situations, this patch prints the IRQ number and action name of that pending wakeup irq which prevents suspend. This patch comes from the Android patch set, where its been used to debug suspend problems. Cc: Pavel Machek <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: Len Brown <[email protected]> Cc: [email protected] Cc: Android Kernel Team <[email protected]> Cc: John Stultz <[email protected]> Cc: Sumit Semwal <[email protected]> Signed-off-by: Todd Poynor <[email protected]> [Amit Pundir: Reworded the commit message] Signed-off-by: Amit Pundir <[email protected]> --- kernel/irq/pm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index abcd6ca..c2bc8d9 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -109,8 +109,13 @@ int check_wakeup_irqs(void) * can abort suspend. */ if (irqd_is_wakeup_set(&desc->irq_data)) { - if (desc->depth == 1 && desc->istate & IRQS_PENDING) + if (desc->depth == 1 && desc->istate & IRQS_PENDING) { + pr_info("Wakeup IRQ %d %s pending, suspend aborted\n", + irq, + desc->action && desc->action->name ? + desc->action->name : ""); return -EBUSY; + } continue; } /* -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
