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commitfce5423e4fupstream. Bizarrely, there is no lock taken in the irq_ack() helper. This puts the ACK callback provided by a specific platform in a awkward situation where there is no synchronization that would be expected on other callback. Introduce the required lock, giving some level of uniformity among callbacks. Fixes:7c5925afbc("PCI: dwc: Move MSI IRQs allocation to IRQ domains hierarchical API") Link: https://lore.kernel.org/linux-pci/20181113225734.8026-1-marc.zyngier@arm.com/ Tested-by: Niklas Cassel <niklas.cassel@linaro.org> Tested-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> Tested-by: Stanimir Varbanov <svarbanov@mm-sol.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>