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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>
This commit is contained in:
Joe Jin 2011-01-07 14:50:12 +08:00 committed by Konrad Rzeszutek Wilk
parent fc550e9592
commit 110e7c7e4f
1 changed files with 3 additions and 0 deletions
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3
drivers/xen/events.c
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@ -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;
}