On 20/04/16 12:03, Jon Hunter wrote: > Setting the interrupt type for private peripheral interrupts (PPIs) may > not be supported by a given GIC because it is IMPLEMENTATION DEFINED > whether this is allowed. There is no way to know if setting the type is > supported for a given GIC and so the value written is read back to > verify it matches the desired configuration. If it does not match then > an error is return. > > There are cases where the interrupt configuration read from firmware > (such as a device-tree blob), has been incorrect and hence > gic_configure_irq() has returned an error. This error has gone > undetected because the error code returned was ignored but the interrupt > still worked fine because the configuration for the interrupt could not > be overwritten. > > Given that this has done undetected and that failing to set the > configuration for a PPI may not be a catastrophic, don't return an error > but WARN if we fail to configure a PPI. This will allows us to fix up > any places in the kernel where we should be checking the return status > and maintain backward compatibility with firmware images that may have > incorrect PPI configurations. > > Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx> Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx> M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
