On Tue, May 01, 2012 at 09:12:38PM -0500, Robert Lee wrote: > Add common cpuidle init functionality that can be used by various > imx platforms. > > Signed-off-by: Robert Lee <rob....@linaro.org> > --- > + > +int __init imx_cpuidle_init(struct cpuidle_driver *drv) > +{ > + struct cpuidle_device *dev; > + int cpu_id, ret; > + > + if (!drv || drv->state_count > CPUIDLE_STATE_MAX) {
Please don't check for !drv here. When someone calls this function with a NULL pointer he should get a nive stack trace allowing him to figure out what went wrong. > + pr_err("%s: Invalid Input\n", __func__); > + return -EINVAL; > + } > + > + ret = cpuidle_register_driver(drv); > + if (ret) { > + pr_err("%s: Failed to register cpuidle driver with error: %d\n", > + __func__, ret); > + return ret; > + } > + > + imx_cpuidle_devices = alloc_percpu(struct cpuidle_device); > + if (imx_cpuidle_devices == NULL) { > + ret = -ENOMEM; > + goto unregister_drv; > + } > + > + /* initialize state data for each cpuidle_device */ > + for_each_possible_cpu(cpu_id) { > + dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id); > + dev->cpu = cpu_id; > + dev->state_count = drv->state_count; > + > + ret = cpuidle_register_device(dev); > + if (ret) { > + pr_err("%s: Failed to register cpu %u\n", > + __func__, cpu_id); > + goto uninit; You should only unregister the cpuidle devices you successfully registered. Unregistering not yet registered cpuidle devices probably has unwanted side effects. Sascha > + } > + } > + > + return 0; > + > +uninit: > + imx_cpuidle_devices_uninit(); > + > +unregister_drv: > + cpuidle_unregister_driver(drv); > + return ret; > +} > diff --git a/arch/arm/plat-mxc/include/mach/cpuidle.h > b/arch/arm/plat-mxc/include/mach/cpuidle.h > new file mode 100644 > index 0000000..8612510 > --- /dev/null > +++ b/arch/arm/plat-mxc/include/mach/cpuidle.h > @@ -0,0 +1,22 @@ > +/* > + * Copyright 2012 Freescale Semiconductor, Inc. > + * Copyright 2012 Linaro Ltd. > + * > + * The code contained herein is licensed under the GNU General Public > + * License. You may obtain a copy of the GNU General Public License > + * Version 2 or later at the following locations: > + * > + * http://www.opensource.org/licenses/gpl-license.html > + * http://www.gnu.org/copyleft/gpl.html > + */ > + > +#include <linux/cpuidle.h> > + > +#ifdef CONFIG_CPU_IDLE > +extern void imx_cpuidle_devices_uninit(void); > +extern int imx_cpuidle_init(struct cpuidle_driver *drv); > +#else > +static inline void imx_cpuidle_devices_uninit(void) {} > +static inline int imx_cpuidle_init(struct cpuidle_driver *drv) > +{ return -ENODEV; } > +#endif > -- > 1.7.10 > > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev