Commit 593292df authored Jan 13, 2015 by Mitchel Humpherys Committed by Matt Wagantall May 30, 2015

iommu/arm-smmu: use a threaded handler for context interrupts



Context interrupts can call domain-specific handlers which might sleep.
Currently we register our handler with request_irq, so our handler is
called in atomic context, so domain handlers that sleep result in an
invalid context BUG.  Fix this by using request_threaded_irq.

This also prepares the way for doing things like enabling clocks within
our interrupt handler.

Change-Id: I2f12f2aa234b62532807a208cd70f2d705083343
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>

parent fe92d4be

drivers/iommu/arm-smmu.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -1144,7 +1144,8 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
		spin_unlock_irqrestore(&smmu_domain->lock, flags);

		irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx];
		ret = request_irq(irq, arm_smmu_context_fault, IRQF_SHARED,
		ret = request_threaded_irq(irq, NULL, arm_smmu_context_fault,
		IRQF_ONESHOT \| IRQF_SHARED,
		"arm-smmu-context-fault", domain);
		if (IS_ERR_VALUE(ret)) {
		dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n",