diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-11-12 14:10:39 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-11-12 16:10:00 +0000 |
| commit | 10a20b34d735fb4a4af067919b9c0a1c870dac99 (patch) | |
| tree | fd32730314fd307b3eaf1573f2b7845e3cd16f46 /drivers | |
| parent | 69ea463021be0d159ab30f96195fb0dd18ee2272 (diff) | |
| download | linux-10a20b34d735fb4a4af067919b9c0a1c870dac99.tar.bz2 | |
of/irq: Don't ignore interrupt-controller when interrupt-map failed
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@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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/of/irq.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c index 32be5a03951f..b10f015b2e37 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 +245,20 @@ 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 |