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of/irq: Don't ignore interrupt-controller when interrupt-map failed

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Since 0412841812 ("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: 0412841812 ("of/irq: Allow matching of an interrupt-map local to an interrupt controller")
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/78308692-02e6-9544-4035-3171a8e1e6d4@xenosoft.de
Link: https://lore.kernel.org/r/20211112143644.434995-1-maz@kernel.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Marc Zyngier 2021-11-12 14:10:39 +00:00
parent 69ea463021
commit 10a20b34d7
1 changed files with 16 additions and 3 deletions
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19
drivers/of/irq.c
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@ -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 +245,20 @@ 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) {
/*
* The PASEMI Nemo is a known offender, so
* let's only warn for anyone else.
*/
WARN(!IS_ENABLED(CONFIG_PPC_PASEMI),
"%pOF interrupt-map failed, using interrupt-controller\n",
ipar);
return 0;
}
goto fail;
}
/*
* Successfully parsed an interrrupt-map translation; copy new