linux-kernel - Re: [PATCH 1/8] staging: vchiq_arm: replace sleep() with usleep

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Date:   Wed, 15 Sep 2021 09:06:09 +0100
From:   Phil Elwell <phil@...pberrypi.com>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        Gaston Gonzalez <gascoar@...il.com>,
        linux-staging@...ts.linux.dev
Cc:     gregkh@...uxfoundation.org, nsaenz@...nel.org, arnd@...db.de,
        dan.carpenter@...cle.com, ojaswin98@...il.com,
        amarjargal16@...il.com, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] staging: vchiq_arm: replace sleep() with
 usleep_range()

Hi Stefan,

On 15/09/2021 06:21, Stefan Wahren wrote:
> Hi,
> 
> Am 14.09.21 um 23:35 schrieb Gaston Gonzalez:
>> usleep_range() should be used instead of sleep() when sleepings range
>> from 10 us to 20 ms, [1].
>>
>> Reported by checkpatch.pl
>>
>> [1] Documentation/timers/timers-howto.txt
>> ---
>>   drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
>> index b25369a13452..0214ae37e01f 100644
>> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
>> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
>> @@ -824,7 +824,7 @@ vchiq_bulk_transmit(unsigned int handle, const void *data, unsigned int size,
>>   		if (status != VCHIQ_RETRY)
>>   			break;
>>   
>> -		msleep(1);
>> +		usleep_range(1000, 1100);
> 
> from my understanding the usage of usleep_range() and hrtimers isn't
> necessary here. The intention is to sleep a little bit and not "exactly"
> 1 ms.
> 
> @Phil Elwell: what is your opinion?

Exactly - the aim is just to stop it spinning.

Phil