From mboxrd@z Thu Jan 1 00:00:00 1970 From: stefano@stabellini.net Subject: [PATCH 07/13] Fix find_unbound_irq in presence of ioapic irqs. Date: Mon, 21 Jun 2010 17:14:01 +0100 Message-ID: <1277136847-13266-7-git-send-email-stefano@stabellini.net> References: Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: xen-devel@lists.xensource.com, Stefano.Stabellini@eu.citrix.com, sheng@linux.intel.com, ddutile@redhat.com, jeremy@goop.org, Stefano Stabellini List-Id: xen-devel@lists.xenproject.org From: Stefano Stabellini Don't break the assumption that the first 16 irqs are ISA irqs; make sure that the irq is actually free before using it. Signed-off-by: Stefano Stabellini --- drivers/xen/events.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-) diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 0f7546e..b029a32 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -340,9 +340,18 @@ static int find_unbound_irq(void) int irq; struct irq_desc *desc; - for (irq = 0; irq < nr_irqs; irq++) + for (irq = 0; irq < nr_irqs; irq++) { + desc = irq_to_desc(irq); + /* only 0->15 have init'd desc; handle irq > 16 */ + if (desc == NULL) + break; + if (desc->chip == &no_irq_chip) + break; + if (desc->chip != &xen_dynamic_chip) + continue; if (irq_info[irq].type == IRQT_UNBOUND) break; + } if (irq == nr_irqs) panic("No available IRQ to bind to: increase nr_irqs!\n"); -- 1.7.0.4