Commit 110e7c7e authored Jan 07, 2011 by Joe Jin Committed by Konrad Rzeszutek Wilk Jan 10, 2011

xen/event: validate irq before get evtchn by irq



When retrieving the event channel number from irq, the irq
number may not be valid under some conditions.

So far that can be when we suspend/resume and irq ends with -1.
Validate and return sanitized irq and provide diagnostics information.

[v3: added unlikely on the WARN path]
[v2: reworded the commit message]
Signed-off-by: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Gurudas Pai <gurudas.pai@oracle.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andrew Morton <akpm@linux-foundation.org>

parent fc550e95

drivers/xen/events.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -170,6 +170,9 @@ static struct irq_info *info_for_irq(unsigned irq)

		static unsigned int evtchn_from_irq(unsigned irq)
		{
		if (unlikely(WARN(irq < 0 \|\| irq >= nr_irqs, "Invalid irq %d!\n", irq)))
		return 0;

		return info_for_irq(irq)->evtchn;
		}