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| author |   Stephen Boyd <sboyd@codeaurora.org> | 2018-02-01 09:03:29 -0800 |
|---|---|---|
| committer |   Marc Zyngier <marc.zyngier@arm.com> | 2018-02-16 13:47:58 +0000 |
| commit | 95a2562590c2f64a0398183f978d5cf3db6d0284 (patch) | |
| tree | 29ee17f162eeb747b744c1900295aa300004f4be /drivers/irqchip/irq-gic-v3-its-pci-msi.c | |
| parent | irqchip/gic-v3: Use wmb() instead of smb_wmb() in gic_raise_softirq() (diff) | |
| download | linux-dev-95a2562590c2f64a0398183f978d5cf3db6d0284.tar.xz linux-dev-95a2562590c2f64a0398183f978d5cf3db6d0284.zip | |
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.c | 2 |
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; |