From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guenter Roeck Subject: Re: [PATCH 12/44] mfd: ab8500-sysctrl: Register with kernel poweroff handler Date: Thu, 9 Oct 2014 08:54:04 -0700 Message-ID: <20141009155404.GC31987@roeck-us.net> References: <1412659726-29957-1-git-send-email-linux@roeck-us.net> <1412659726-29957-13-git-send-email-linux@roeck-us.net> <20141007080048.GB25331@lee--X1> <20141009103656.GF17836@e104818-lin.cambridge.arm.com> <20141009104927.GN20647@lee--X1> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=yTHPn6FXE9DCZLPDU0xnaAN7oKKZ0p3HDnJX2zJudGk=; b=a8hdupblssG+OYy2DtvfEv1Vq+JRlB3PoxRYDmE/CJ1tsmvGfHN0RGLImT80BVJFHm q1gbyW+BRFVKRsdsErApbeYGJU/E2WCPnZ3M1TJGAvcCcilrM1xiIstXEjJEIeumeZou W8AJn3rYi0UfUL7KV3kFJaTqdzP4r+aNORpaWq4YgA/P9dHjb56VxMUyerQYA8fFvIaY VG5FDpelavOY4fwSgrYqqxTDKrMtlw4ZSTMa9yg4yBun+v/9uO64yBBFjb+Jek5Q7tf7 m13jnF0bscDjGj8Qd4zOa7IH/6DWBdBLQe18mbd3ca1zkjzFYrDSKvDsC1siSQfVJKsO T5GA== Content-Disposition: inline In-Reply-To: <20141009104927.GN20647@lee--X1> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Lee Jones Cc: Catalin Marinas , "linux-m32r-ja-rQhvJZKUsGBRYuoOT4C5/9i2O/JbrIOy@public.gmane.org" , "linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org" , "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-ia64-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-xtensa-PjhNF2WwrV/0Sa2dR60CXw@public.gmane.org" , Linus Walleij , "devel-gWbeCf7V1WCQmaza687I9mD2FQJk+8+b@public.gmane.org" , "linux-s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "lguest-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org" , "linux-c6x-dev-jPsnJVOj+W6hPH1hqNUYSQ@public.gmane.org" , "linux-hexagon-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "xen-devel-GuqFBffKawtpuQazS67q72D2FQJk+8+b@public.gmane.org" , devicetree On Thu, Oct 09, 2014 at 11:49:27AM +0100, Lee Jones wrote: > On Thu, 09 Oct 2014, Catalin Marinas wrote: > > > On Tue, Oct 07, 2014 at 09:00:48AM +0100, Lee Jones wrote: > > > On Mon, 06 Oct 2014, Guenter Roeck wrote: > > > > --- a/drivers/mfd/ab8500-sysctrl.c > > > > +++ b/drivers/mfd/ab8500-sysctrl.c > > > > @@ -6,6 +6,7 @@ > > > > > > [...] > > > > > > > +static int ab8500_power_off(struct notifier_block *this, unsigned long unused1, > > > > + void *unused2) > > > > { > > > > sigset_t old; > > > > sigset_t all; > > > > @@ -34,11 +36,6 @@ static void ab8500_power_off(void) > > > > struct power_supply *psy; > > > > int ret; > > > > > > > > - if (sysctrl_dev == NULL) { > > > > - pr_err("%s: sysctrl not initialized\n", __func__); > > > > - return; > > > > - } > > > > > > Can you explain the purpose of this change please? > > > > I guess it's because the sysctrl_dev is already initialised when > > registering the power_off handler, so there isn't a way to call the > > above function with a NULL sysctrl_dev. Probably even with the original > > code you didn't need this check (after some race fix in > > ab8500_sysctrl_remove but races is one of the things Guenter's patches > > try to address). > > Sounds reasonable, although I think this change should be part of > another patch. > Turns out the options are to either drop the check or to use the device managed function to register the poweroff handler. I decided to keep the check and use the device managed function. Guenter