linux-kernel - Re: [PATCH] firmware_class: make firmware caching configurable

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Message-ID: <4bca568b-4ffd-f880-7273-37db4d9f8f54@android.com>
Date:   Wed, 13 Nov 2019 14:33:44 -0800
From:   Mark Salyzyn <salyzyn@...roid.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Tim Murray <timmurray@...gle.com>,
        Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH] firmware_class: make firmware caching configurable

On 11/13/19 1:50 PM, Greg Kroah-Hartman wrote:
> On Wed, Nov 13, 2019 at 01:01:13PM -0800, Mark Salyzyn wrote:
>> Because firmware caching generates uevent messages that are sent over
>> a netlink socket, it can prevent suspend on many platforms.  It's
>> also not always useful, so make it a configurable option.
>>
>> Signed-off-by: Mark Salyzyn <salyzyn@...roid.com>
>> Cc: Tim Murray <timmurray@...gle.com>
>> Cc: Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>
>> Acked-by: Luis Chamberlain <mcgrof@...nel.org>
>> ---
>>   drivers/base/Kconfig                | 13 +++++++++++++
>>   drivers/base/firmware_loader/main.c |  6 +++---
>>   2 files changed, 16 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
>> index 28b92e3cc570..36351c3a62b0 100644
>> --- a/drivers/base/Kconfig
>> +++ b/drivers/base/Kconfig
>> @@ -89,6 +89,19 @@ config PREVENT_FIRMWARE_BUILD
>>   
>>   source "drivers/base/firmware_loader/Kconfig"
>>   
>> +config FW_CACHE
>> +	bool "Enable firmware caching during suspend"
>> +	depends on PM_SLEEP
>> +	default y
>> +	help
>> +	  Because firmware caching generates uevent messages that are sent
>> +	  over a netlink socket, it can prevent suspend on many platforms.
>> +	  It is also not always useful, so on such platforms we have the
>> +	  option.
>> +
>> +	  If unsure, say Y.
>> +
>> +
> Shouldn't this entry go into drivers/base/firmware_loader/Kconfig
> instead and depend on FW_LOADER by putting it in the correct location in
> that file?

Good point, respin on its way.

>
> Also, no need for two blank lines.
<not sure how the double lines showed up, checkpatch,pl should look for 
this>
>
> And finally, 'default y' is only a good idea if your machine can not
> boot without the option.  I don't think that's the case here, correct?
>
> thanks,
>
> greg k-h

I am concerned about the change in user space behavior and to prevent 
defconfig churn.