Since 041284181226 ("of/irq: Allow matching of an interrupt-map local
to an interrupt controller"), the irq code favors using an interrupt-map
over a interrupt-controller property if both are available, while the
earlier behaviour was to ignore the interrupt-map altogether.
However, we now end-up with the opposite behaviour, which is to
ignore the interrupt-controller property even if the interrupt-map
fails to match its input. This new behaviour breaks the AmigaOne
X1000 machine, which ships with an extremely "creative" (read:
broken) device tree.
Fix this by allowing the interrupt-controller property to be selected
when interrupt-map fails to match anything.
Fixes: 041284181226 ("of/irq: Allow matching of an interrupt-map local to an interrupt controller")
Reported-by: Christian Zigotzky <chzigotzky@xxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/78308692-02e6-9544-4035-3171a8e1e6d4@xxxxxxxxxxx
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/of/irq.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 32be5a03951f..508fb1717de3 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -161,9 +161,10 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
* if it is then we are done, unless there is an
* interrupt-map which takes precedence.
*/
+ bool intc = of_property_read_bool(ipar, "interrupt-controller");
+
imap = of_get_property(ipar, "interrupt-map", &imaplen);
- if (imap == NULL &&
- of_property_read_bool(ipar, "interrupt-controller")) {
+ if (imap == NULL && intc) {
pr_debug(" -> got it !\n");
return 0;
}
@@ -244,8 +245,14 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
pr_debug(" -> imaplen=%d\n", imaplen);
}
- if (!match)
+ if (!match) {
+ if (intc) {
+ pr_debug("%pOF interrupt-map failed, using interrupt-controller\n", ipar);
+ return 0;
+ }
+
goto fail;
+ }
/*
* Successfully parsed an interrrupt-map translation; copy new
--
2.30.2
