linux-kernel - Re: [PATCH 2/2] pda_power: Unregister USB notifier in pda_power

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Date:	Mon, 14 Apr 2014 17:08:05 -0500
From:	Felipe Balbi <balbi@...com>
To:	Mathias Krause <minipli@...glemail.com>
CC:	Felipe Balbi <balbi@...com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	PaX Team <pageexec@...email.hu>,
	Anton Vorontsov <anton@...msg.org>
Subject: Re: [PATCH 2/2] pda_power: Unregister USB notifier in
 pda_power_remove()

On Tue, Apr 15, 2014 at 12:07:13AM +0200, Mathias Krause wrote:
> On 14 April 2014 23:35, Felipe Balbi <balbi@...com> wrote:
> > On Sun, Mar 30, 2014 at 03:34:15PM +0200, Mathias Krause wrote:
> >> If we've registered a notifier in pda_power_probe() we must deregister
> >> it in pda_power_remove() to not let it work on stale data like, e.g.,
> >> the charger timer.
> >>
> >> Cc: Felipe Balbi <balbi@...com>
> >> Cc: Anton Vorontsov <anton@...msg.org>
> >> Signed-off-by: Mathias Krause <minipli@...glemail.com>
> >> ---
> >>  drivers/power/pda_power.c |    5 +++++
> >>  1 file changed, 5 insertions(+)
> >>
> >> diff --git a/drivers/power/pda_power.c b/drivers/power/pda_power.c
> >> index 87a963d0a8..aba23d6848 100644
> >> --- a/drivers/power/pda_power.c
> >> +++ b/drivers/power/pda_power.c
> >> @@ -430,6 +430,11 @@ static int pda_power_remove(struct platform_device *pdev)
> >>       if (pdata->is_ac_online && ac_irq)
> >>               free_irq(ac_irq->start, &pda_psy_ac);
> >>
> >> +#if IS_ENABLED(CONFIG_USB_PHY)
> >> +     if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier)
> >
> > IS_ERR() should be enough here.
> 
> That's true! The usb_get_phy() call in pda_power_probe() will always
> return a valid pointer or an ERR_PTR() -- never NULL. Albeit, looking
> at usb_get_phy(), it contains another bug, returning a valid pointer,
> even when the try_module_get() call fails. *sigh* It should set ptr to
> an ERR_PTR() in this case.

good catch, can you send a patch for that ?

> Anyway, probably all the transceiver checks in pda_power.c can be
> changed to IS_ERR() checks. The reason I am using IS_ERR_OR_NULL() in
> my patch is that I just copied the test from a few lines below. I'll
> create a follow up patch in case somebody cares about this series in
> the first place.

awesome, thanks

-- 
balbi

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