linux-kernel - Re: [PATCH] net/wireless: enable wiphy device to suspend/resume asynchronously

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Date:	Mon, 17 Aug 2015 09:48:22 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Emmanuel Grumbach <egrumbach@...il.com>
CC:	Johannes Berg <johannes@...solutions.net>,
	David Miller <davem@...emloft.net>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net/wireless: enable wiphy device to suspend/resume asynchronously



On 2015/7/30 13:55, Emmanuel Grumbach wrote:
> On Thu, Jul 30, 2015 at 8:18 AM, Fu, Zhonghui
> <zhonghui.fu@...ux.intel.com> wrote:
>> Enable wiphy device to suspend/resume asynchronously. This can improve
>> system suspend/resume speed.
>>
> How will that impact the timing with respect to the suspend call
> coming from the bus?
> I think that a few drivers rely on the suspend call of the wiphy
> device happening before the suspend call to the bus device.
> Not sure though.

Sorry for late reply.

The suspend/resume timing of wiphy device and related devices will be ensured by their parent/child relationship. So, enabling wiphy device to suspend/resume asynchronously does not change any  dependency. It can only take advantage of multicore and improve system suspend/resume speed.


Thanks,
Zhonghui
>
>> Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
>> ---
>>  net/wireless/core.c |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/net/wireless/core.c b/net/wireless/core.c
>> index 2a0bbd2..bc5e68f 100644
>> --- a/net/wireless/core.c
>> +++ b/net/wireless/core.c
>> @@ -416,6 +416,7 @@ use_default_name:
>>         device_initialize(&rdev->wiphy.dev);
>>         rdev->wiphy.dev.class = &ieee80211_class;
>>         rdev->wiphy.dev.platform_data = rdev;
>> +       device_enable_async_suspend(&rdev->wiphy.dev);
>>
>>         INIT_LIST_HEAD(&rdev->destroy_list);
>>         spin_lock_init(&rdev->destroy_list_lock);
>> -- 1.7.1
>>
>> --
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