linux-kernel - Re: [PATCH] brcmfmac: Remove #ifdef guards for PM related functions

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Message-Id: <X8KLAR.4CU0LCMZIMJH@crapouillou.net>
Date:   Tue, 19 Apr 2022 18:22:09 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>
Cc:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Kalle Valo <kvalo@...nel.org>, linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] brcmfmac: Remove #ifdef guards for PM related functions

Hi Arend,

Le lun., avril 18 2022 at 09:09:46 +0200, Arend van Spriel 
<arend.vanspriel@...adcom.com> a écrit :
> On 4/15/2022 10:03 PM, Paul Cercueil wrote:
>> Use the new DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() macros to
>> handle the .suspend/.resume callbacks.
>> 
>> These macros allow the suspend and resume functions to be 
>> automatically
>> dropped by the compiler when CONFIG_SUSPEND is disabled, without 
>> having
>> to use #ifdef guards. The advantage is then that these functions are 
>> not
>> conditionally compiled.
> 
> The advantage stated here may not be obvious to everyone and that is 
> because it only scratches the surface. The code is always compiled 
> independent from the Kconfig options used and because of that the 
> real advantage is that build regressions are easier to catch.

Exactly. I will improve the commit message to make this a bit more 
explicit.

>> Some other functions not directly called by the .suspend/.resume
>> callbacks, but still related to PM were also taken outside #ifdef
>> guards.
> 
> a few comments on this inline...
> 
>> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
>> ---
>>   .../broadcom/brcm80211/brcmfmac/bcmsdh.c      | 44 
>> +++++++------------
>>   .../broadcom/brcm80211/brcmfmac/sdio.c        |  5 +--
>>   .../broadcom/brcm80211/brcmfmac/sdio.h        | 16 -------
>>   3 files changed, 19 insertions(+), 46 deletions(-)
>> 
>> diff --git 
>> a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c 
>> b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>> index ac02244a6fdf..a8cf5a570101 100644
>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
> 
> [...]
> 
>> @@ -873,7 +865,8 @@ int brcmf_sdiod_remove(struct brcmf_sdio_dev 
>> *sdiodev)
>>   		sdiodev->bus = NULL;
>>   	}
>>   -	brcmf_sdiod_freezer_detach(sdiodev);
>> +	if (IS_ENABLED(CONFIG_PM_SLEEP))
>> +		brcmf_sdiod_freezer_detach(sdiodev);
> 
> Please move the if statement inside the function to keep the code 
> flow in the calling function the same as before.
> 
>>     	/* Disable Function 2 */
>>   	sdio_claim_host(sdiodev->func2);
>> @@ -949,9 +942,11 @@ int brcmf_sdiod_probe(struct brcmf_sdio_dev 
>> *sdiodev)
>>   		goto out;
>>   	}
>>   -	ret = brcmf_sdiod_freezer_attach(sdiodev);
>> -	if (ret)
>> -		goto out;
>> +	if (IS_ENABLED(CONFIG_PM_SLEEP)) {
>> +		ret = brcmf_sdiod_freezer_attach(sdiodev);
>> +		if (ret)
>> +			goto out;
>> +	}
> 
> Dito. Move the if statement inside the function.

Sure.

Cheers,
-Paul

> 
>>     	/* try to attach to the target device */
>>   	sdiodev->bus = brcmf_sdio_probe(sdiodev);