From: Konrad Rzeszutek Wilk Date: Wed, 23 May 2012 17:28:44 +0000 (-0400) Subject: xen/events: Add WARN_ON when quick lookup found invalid type. X-Git-Tag: v2.6.39-400.9.0~543^2~3^2 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=e19207c22bdec63057991a3820af84e818d87272;p=users%2Fjedix%2Flinux-maple.git xen/events: Add WARN_ON when quick lookup found invalid type. All of the bind_XYZ_to_irq do a quick lookup to see if the event exists. And if they that value is returned instead of initialized. This patch adds an extra logic to check that the type returned is the proper one and we can use it to find drivers that are doing something naught. Signed-off-by: Konrad Rzeszutek Wilk --- diff --git a/drivers/xen/events.c b/drivers/xen/events.c index b76706a404f7..1df815f1f065 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -827,6 +827,9 @@ int bind_evtchn_to_irq(unsigned int evtchn) handle_edge_irq, "event"); xen_irq_info_evtchn_init(irq, evtchn); + } else { + struct irq_info *info = info_for_irq(irq); + WARN_ON(info && info->type != IRQT_EVTCHN); } out: @@ -862,8 +865,10 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) xen_irq_info_ipi_init(cpu, irq, evtchn, ipi); bind_evtchn_to_cpu(evtchn, cpu); + } else { + struct irq_info *info = info_for_irq(irq); + WARN_ON(info && info->type != IRQT_IPI); } - out: mutex_unlock(&irq_mapping_update_lock); return irq; @@ -939,8 +944,10 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu) xen_irq_info_virq_init(cpu, irq, evtchn, virq); bind_evtchn_to_cpu(evtchn, cpu); + } else { + struct irq_info *info = info_for_irq(irq); + WARN_ON(info && info->type != IRQT_VIRQ); } - out: mutex_unlock(&irq_mapping_update_lock);