On Wed, Mar 18, 2015 at 06:46:11PM +0000, Daniel Lezcano wrote: > Some architectures have some cpus which does not support idle states. > > Let the underlying low level code to return -ENOSYS when it is not > possible to set an idle state.
http://www.spinics.net/lists/linux-acpi/msg55550.html -ENXIO ? > > Signed-off-by: Daniel Lezcano <daniel.lezc...@linaro.org> > --- > drivers/cpuidle/cpuidle-arm.c | 45 > +++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 43 insertions(+), 2 deletions(-) > > diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c > index 1c94b88..0682ed0 100644 > --- a/drivers/cpuidle/cpuidle-arm.c > +++ b/drivers/cpuidle/cpuidle-arm.c > @@ -17,11 +17,14 @@ > #include <linux/kernel.h> > #include <linux/module.h> > #include <linux/of.h> > +#include <linux/slab.h> > > #include <asm/cpuidle.h> > > #include "dt_idle_states.h" > > +static DEFINE_PER_CPU(struct cpuidle_device, *cpuidle_arm_dev); > + > /* > * arm_enter_idle_state - Programs CPU to enter the specified state > * > @@ -94,6 +97,7 @@ static int __init arm_idle_init(void) > { > int cpu, ret; > struct cpuidle_driver *drv = &arm_idle_driver; > + struct cpuidle_device *dev; > > /* > * Initialize idle states data, starting at index 1. > @@ -105,18 +109,55 @@ static int __init arm_idle_init(void) > if (ret <= 0) > return ret ? : -ENODEV; > > + ret = cpuidle_register_driver(drv); > + if (ret) { > + pr_err("Failed to register cpuidle driver\n"); > + return ret; > + } > + > /* > * Call arch CPU operations in order to initialize > * idle states suspend back-end specific data > */ > for_each_possible_cpu(cpu) { > ret = arm_cpuidle_init(cpu); > + > + /* This cpu does not support any idle states */ > + if (ret == -ENOSYS) > + continue; > + > if (ret) { > pr_err("CPU %d failed to init idle CPU ops\n", cpu); > - return ret; > + goto out_fail; > + } > + > + dev = kzalloc(sizeof(*dev), GFP_KERNEL); > + if (!dev) { > + pr_err("Failed to allocate cpuidle device\n"); > + goto out_fail; > + } > + > + dev->cpu = cpu; > + per_cpu(cpuidle_arm_dev, cpu) = dev; > + > + ret = cpuidle_register_device(dev); > + if (ret) { > + pr_err("Failed to register cpuidle device for CPU %d\n", > + cpu); > + kfree(dev); > + goto out_fail; > } > } > +out: > + return ret; return 0; > > - return cpuidle_register(drv, NULL); > +out_fail: > + for (cpu--; cpu <= 0; cpu--) { This loop is wrong. > + dev = per_cpu(cpuidle_arm_dev, cpu); > + cpuidle_unregister_device(dev); > + kfree(dev); > + } > + cpuidle_unregister_driver(drv); > + goto out; You just: return ret; little point in jumping around to just return. Lorenzo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
