linux-kernel - Re: [PATCH 1/3] usb: musb: fix pm

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Message-ID: <CAMP44s3eeTOBRiFwEL3FypDY_+-MReqYJJVO1URNrnFVFXzvDg@mail.gmail.com>
Date:	Fri, 16 Dec 2011 02:59:57 +0200
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jiri Kosina <trivial@...nel.org>
Subject: Re: [PATCH 1/3] usb: musb: fix pm_runtime mismatches

On Fri, Dec 16, 2011 at 1:22 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Fri, 16 Dec 2011, Felipe Contreras wrote:
>
>> Properly call pm_runtime_put() afer pm_runttime_get() on errors.
>>
>> Untested.
>>
>> Signed-off-by: Felipe Contreras <felipe.contreras@...il.com>
>> ---
>>  drivers/usb/musb/musb_gadget.c |    1 +
>>  drivers/usb/musb/omap2430.c    |    1 +
>>  2 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
>> index 922148f..95bfd2d 100644
>> --- a/drivers/usb/musb/musb_gadget.c
>> +++ b/drivers/usb/musb/musb_gadget.c
>> @@ -1960,6 +1960,7 @@ static int musb_gadget_start(struct usb_gadget *g,
>>  err2:
>>       if (!is_otg_enabled(musb))
>>               musb_stop(musb);
>> +     pm_runtime_put(musb->controller);
>>  err0:
>>       return retval;
>>  }
>> diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
>> index ba85f27..4edfb91 100644
>> --- a/drivers/usb/musb/omap2430.c
>> +++ b/drivers/usb/musb/omap2430.c
>> @@ -385,6 +385,7 @@ static void omap2430_musb_disable(struct musb *musb)
>>
>>  static int omap2430_musb_exit(struct musb *musb)
>>  {
>> +     pm_runtime_put(musb->controller);
>>       del_timer_sync(&musb_idle_timer);
>>
>>       omap2430_low_level_exit(musb);
>
> Should these calls be pm_runtime_put_sync() instead of
> pm_runtime_put()?

I don't see why... The thing failed, it's not going to be used any
more so better let PM deactivate the device. But now that you point
this out, pm_runtime_put() on omap2430_musb_exit() should probably go
at the end of the function, after all the actions have been done.

I'll send an updated patch tomorrow, if there are no further comments.

Cheers.

-- 
Felipe Contreras
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