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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-05-06 11:37:43 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-05-06 11:37:43 +1000 |
| commit | 5fe0c1f2f0dca3351536284b0180a79f341b7854 (patch) | |
| tree | 20e7cc0ae006c8e21fb476d27eeed30771262706 /kernel | |
| parent | f3d40c2532fee15a30d7a364ac365c21748a4a95 (diff) | |
| download | linux-stable-5fe0c1f2f0dca3351536284b0180a79f341b7854.tar.gz linux-stable-5fe0c1f2f0dca3351536284b0180a79f341b7854.tar.bz2 linux-stable-5fe0c1f2f0dca3351536284b0180a79f341b7854.zip | |
irqdomain: Allow quiet failure mode
Some interrupt controllers refuse to map interrupts marked as
"protected" by firwmare. Since we try to map everyting in the
device-tree on some platforms, we end up with a lot of nasty
WARN's in the boot log for what is a normal situation on those
machines.
This defines a specific return code (-EPERM) from the host map()
callback which cause irqdomain to fail silently.
MPIC is updated to return this when hitting a protected source
printing only a single line message for diagnostic purposes.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/irqdomain.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 96f3a1d9c379..5a83dde8ca0c 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -462,9 +462,23 @@ int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, if (domain->ops->map) { ret = domain->ops->map(domain, virq, hwirq); if (ret != 0) { - pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n", - virq, hwirq, ret); - WARN_ON(1); + /* + * If map() returns -EPERM, this interrupt is protected + * by the firmware or some other service and shall not + * be mapped. + * + * Since on some platforms we blindly try to map everything + * we end up with a log full of backtraces. + * + * So instead, we silently fail on -EPERM, it is the + * responsibility of the PIC driver to display a relevant + * message if needed. + */ + if (ret != -EPERM) { + pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n", + virq, hwirq, ret); + WARN_ON(1); + } irq_data->domain = NULL; irq_data->hwirq = 0; goto err_unmap; |