linux-kernel - Re: [PATCH 1/2] host: ehci-exynos: Convert to use the SET_SYSTEM_SLEEP_PM

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Message-ID: <CANAwSgSr6-0x47=0P_NCiGCv=FSZR9dNT89JpY=9R_32U8HywQ@mail.gmail.com>
Date:   Sun, 9 Oct 2016 22:45:40 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] host: ehci-exynos: Convert to use the SET_SYSTEM_SLEEP_PM_OPS

Hi Krzysztof,

On 9 October 2016 at 22:04, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> On Sun, Oct 09, 2016 at 02:34:14PM +0000, Anand Moon wrote:
>> Move the ehci-exynos system PM callbacks within #ifdef CONFIG_PM_SLEEP
>> as to avoid them being build when not used. This also allows us to use the
>> SET_SYSTEM_SLEEP_PM_OPS macro which simplifies the code.
>>
>> Signed-off-by: Anand Moon <linux.amoon@...il.com>
>> ---
>>  drivers/usb/host/ehci-exynos.c | 14 ++++++--------
>>  1 file changed, 6 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
>> index 42e5b66..1899900 100644
>> --- a/drivers/usb/host/ehci-exynos.c
>> +++ b/drivers/usb/host/ehci-exynos.c
>> @@ -251,7 +251,7 @@ static int exynos_ehci_remove(struct platform_device *pdev)
>>       return 0;
>>  }
>>
>> -#ifdef CONFIG_PM
>> +#ifdef CONFIG_PM_SLEEP
>
> Does not look like an equivalent change. How will it behave in a config
> with !SUSPEND && !HIBERNATE && PM?
>

[snip]

I just wanted to update suspend and resume callback to use
SET_SYSTEM_SLEEP_PM_OPS
as they are define under CONFIG_PM_SLEEP so I update above to avoid
compilation warning/error.

http://lxr.free-electrons.com/source/include/linux/pm.h#L321

-Best Regards
Anand Moon