linux-kernel - Re: [PATCH v2 14/15] media: anysee: Fix link to outdated sleep function documentation

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Message-ID: <8734l3vspp.fsf@somnus>
Date: Fri, 11 Oct 2024 12:28:50 +0200
From: Anna-Maria Behnsen <anna-maria@...utronix.de>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Jonathan Corbet <corbet@....net>,
 linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>, "Rafael J.
 Wysocki" <rafael@...nel.org>, Mauro Carvalho Chehab <mchehab@...nel.org>,
 linux-media@...r.kernel.org, bigeasy@...utronix.de
Subject: Re: [PATCH v2 14/15] media: anysee: Fix link to outdated sleep
 function documentation

Frederic Weisbecker <frederic@...nel.org> writes:

> Le Wed, Sep 11, 2024 at 07:13:40AM +0200, Anna-Maria Behnsen a écrit :
>> The TODO FIXME comment references the outdated lower limit for msleep()
>> function of 20ms. As this is not right and the proper documentation of
>> msleep() is now part of the function description, remove the old stuff and
>> point to the up to date documentation.
>> 
>> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
>> Cc: linux-media@...r.kernel.org
>> Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
>> ---
>>  drivers/media/usb/dvb-usb-v2/anysee.c | 6 ++----
>>  1 file changed, 2 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/media/usb/dvb-usb-v2/anysee.c b/drivers/media/usb/dvb-usb-v2/anysee.c
>> index 8699846eb416..b2f5db961245 100644
>> --- a/drivers/media/usb/dvb-usb-v2/anysee.c
>> +++ b/drivers/media/usb/dvb-usb-v2/anysee.c
>> @@ -55,10 +55,8 @@ static int anysee_ctrl_msg(struct dvb_usb_device *d,
>>  
>>  	/* TODO FIXME: dvb_usb_generic_rw() fails rarely with error code -32
>>  	 * (EPIPE, Broken pipe). Function supports currently msleep() as a
>> -	 * parameter but I would not like to use it, since according to
>> -	 * Documentation/timers/timers-howto.rst it should not be used such
>> -	 * short, under < 20ms, sleeps. Repeating failed message would be
>> -	 * better choice as not to add unwanted delays...
>> +	 * parameter. Check msleep() for details. Repeating failed message would
>> +	 * be better choice as not to add unwanted delays...
>
> Does the comment still matches any up-to-date worry? It passes 2000 ms which is
> 2 seconds...

I had a closer look at it: dvb_usb_generic_rw() is no longer used. The
v2 interfaces are used anyway and this uses usleep_range() instead of
msleep().

I updated the patch and also talked to Sebastian. Will send an update
with v3 which removes and updates the comments.

> Thanks.
>
>>  	 * Fixing that correctly is one of those or both;
>>  	 * 1) use repeat if possible
>>  	 * 2) add suitable delay
>> 
>> -- 
>> 2.39.2
>>