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IRQ remapping is only supported when all IOMMUs in the system support it. So check if all IOMMUs in the system support IRQ remapping before doing the allocations. [Jiang] 1) Rebased to v3.19. 2) Remove redundant check of ecap_ir_support(iommu->ecap) in function intel_enable_irq_remapping(). Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Tested-by: Joerg Roedel <joro@8bytes.org> Cc: Tony Luck <tony.luck@intel.com> Cc: iommu@lists.linux-foundation.org Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Link: http://lkml.kernel.org/r/1420615903-28253-10-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>