x86, iommu: Mark DMAR IRQ as non-threaded

commit 477694e71113fd0694b6bb0bcc2d006b8ac62691 upstream.

Mark this lowlevel IRQ handler as non-threaded. This prevents a boot
crash when "threadirqs" is on the kernel commandline. Also the
interrupt handler is handling hardware critical events which should
not be delayed into a thread.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 3dc9befa5aec06343691474420ad203963119bdb..6dcc7e2d54de33b1c3c78add5d328bc44c88e76a 100644 (file)
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -1388,7 +1388,7 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
                return ret;
        }
 
-       ret = request_irq(irq, dmar_fault, 0, iommu->name, iommu);
+       ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu);
        if (ret)
                printk(KERN_ERR "IOMMU: can't request irq\n");
        return ret;