Re: [Xen-devel] [PATCH 12/44] mfd: ab8500-sysctrl: Register with kernel poweroff handler

[Lee Jones <lee.jones@xxxxxxxxxx>]

On Thu, 09 Oct 2014, Guenter Roeck wrote:

> On 10/09/2014 03:49 AM, 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.
> >
> Sure, no problem. I'll split this into two patches.
> 
> Since we are at it, any idea what to do with the restart function
> in the same file ? It is not used anywhere.

You can strip it out with Linus Walleij's Ack.  Or I'll be happy to do
it?

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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