On Wed, Nov 16, 2016 at 09:49:04PM +0800, fu.wei@xxxxxxxxxx wrote: > +#define for_each_platform_timer(_g) for (; _g; _g = next_platform_timer(_g)) This doesn't fit the usual for_each_* pattern, since _g has to be manually initialised first. Either come up with a way of maknig this fit the usual pattern, or get rid of this, and use: t = however_you_get_the_first_timer(); if (!t) bailt_out_somehow(); do { ... } while (t = next_platform_timer(t)); > +/* > + * Release the memory we have allocated in acpi_gtdt_init. > + * This should be called, when the driver who called "acpi_gtdt_init" previously > + * doesn't need the GTDT info anymore. > + */ > +void __init acpi_gtdt_release(void) > +{ > + kfree(timer_block); > + kfree(watchdog); > + timer_block = NULL; > + watchdog = NULL; > +} Why is this not simply in the error path of acpi_gtdt_init()? > + > +/* > + * Get some basic info from GTDT table, and init the global variables above > + * for all timers initialization of Generic Timer. > + * This function does some validation on GTDT table. > + */ > +int __init acpi_gtdt_init(struct acpi_table_header *table) > +{ > + timer_block = kcalloc(timer_count, > + sizeof(struct acpi_gtdt_timer_block *), > + GFP_KERNEL); > + if (!timer_block) > + return -ENOMEM; > + > + watchdog = kcalloc(timer_count, sizeof(struct acpi_gtdt_watchdog *), > + GFP_KERNEL); > + if (!watchdog) { > + kfree(timer_block); > + timer_block = NULL; > + return -ENOMEM; > + } Please have a common error path below, and branch to that when you need to free these. > +error: > + acpi_gtdt_release(); > + return -EINVAL; > +} [...] > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 61a3d90..a1611d1 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -577,6 +577,13 @@ enum acpi_reconfig_event { > int acpi_reconfig_notifier_register(struct notifier_block *nb); > int acpi_reconfig_notifier_unregister(struct notifier_block *nb); > > +#ifdef CONFIG_ACPI_GTDT > +int acpi_gtdt_init(struct acpi_table_header *table); > +int acpi_gtdt_map_ppi(int type); > +bool acpi_gtdt_c3stop(int type); > +void acpi_gtdt_release(void); Why do these need to be here? What possible value is ther in exporting acpi_gtdt_release() !? Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html