linux-kernel - Re: [PATCH 11/11] sound/oxygen_io: take msecs_to_jiffies

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Date:	Mon, 13 May 2013 16:30:18 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Imre Deak <imre.deak@...el.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org
Subject: Re: [PATCH 11/11] sound/oxygen_io: take msecs_to_jiffies_min into
 use

Takashi Iwai wrote:
> Imre Deak wrote:
>> Use msecs_to_jiffies_min instead of open-coding the same.
>>
>> +++ b/sound/pci/oxygen/oxygen_io.c
>> @@ -108,7 +108,7 @@ static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
>>  	wait_event_timeout(chip->ac97_waitqueue,
>>  			   ({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
>>  			      status & mask; }),
>> -			   msecs_to_jiffies(1) + 1);
>> +			   msecs_to_jiffies_min(1));
>
> This would change the behavior, I guess.

No, that's exactly how msecs_to_jiffies_min would be implemented.

> (Though, I'm not sure whether the original code was intentional.)

When I wrote this, I was not able to prove that msecs_to_jiffies always
rounds up.  (And I guess it doesn't; otherwise the _min variant would
not be needed.)


Regards,
Clemens
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