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authorStephen Boyd <sboyd@codeaurora.org>2018-02-01 20:03:29 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2018-02-16 16:47:58 +0300
commit95a2562590c2f64a0398183f978d5cf3db6d0284 (patch)
tree29ee17f162eeb747b744c1900295aa300004f4be /drivers/irqchip/irq-gic-v3-its-pci-msi.c
parent21ec30c0ef5234fb1039cc7c7737d885bf875a9e (diff)
downloadlinux-95a2562590c2f64a0398183f978d5cf3db6d0284.tar.xz
irqchip/gic-v3: Ignore disabled ITS nodes
On some platforms there's an ITS available but it's not enabled because reading or writing the registers is denied by the firmware. In fact, reading or writing them will cause the system to reset. We could remove the node from DT in such a case, but it's better to skip nodes that are marked as "disabled" in DT so that we can describe the hardware that exists and use the status property to indicate how the firmware has configured things. Cc: Stuart Yoder <stuyoder@gmail.com> Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Rajendra Nayak <rnayak@codeaurora.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its-pci-msi.c')
-rw-r--r--drivers/irqchip/irq-gic-v3-its-pci-msi.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
index 14a8c0a7e095..25a98de5cfb2 100644
--- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
@@ -132,6 +132,8 @@ static int __init its_pci_of_msi_init(void)
for (np = of_find_matching_node(NULL, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
+ if (!of_device_is_available(np))
+ continue;
if (!of_property_read_bool(np, "msi-controller"))
continue;