linux-kernel - [PATCH] ALSA: atmel_abdac: clk_round_rate() can return a zero upon error

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Message-ID: <alpine.DEB.2.02.1312091845340.4127@tamien>
Date:	Mon, 9 Dec 2013 18:49:13 -0800
From:	Paul Walmsley <pwalmsley@...dia.com>
To:	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>
CC:	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] ALSA: atmel_abdac: clk_round_rate() can return a zero upon
 error


Treat both negative and zero return values from clk_round_rate()
as errors.  This is needed since subsequent patches will convert
clk_round_rate()'s return value to be an unsigned type, rather
than a signed type, since some clock sources can generate rates higher
than (2^31)-1 Hz.

Eventually, when calling clk_round_rate(), only a return value of
zero will be considered a error; all other values will be
considered valid rates.  The comparison against values less than
0 is kept to preserve the correct behavior in the meantime.

Signed-off-by: Paul Walmsley <pwalmsley@...dia.com>
Cc: Hans-Christian Egtvedt <egtvedt@...fundet.no>
Cc: Nicolas Ferre <nicolas.ferre@...el.com>
Cc: Takashi Iwai <tiwai@...e.de>
Cc: Jaroslav Kysela <perex@...ex.cz>
---
Applies on v3.13-rc3.  See also:

http://marc.info/?l=linux-arm-kernel&m=138542591313620&w=2

  sound/atmel/abdac.c |    2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/atmel/abdac.c b/sound/atmel/abdac.c
index 721d8fd..3519518 100644
--- a/sound/atmel/abdac.c
+++ b/sound/atmel/abdac.c
@@ -354,7 +354,7 @@ static int set_sample_rates(struct atmel_abdac *dac)
  	/* we start at 192 kHz and work our way down to 5112 Hz */
  	while (new_rate >= RATE_MIN && index < (MAX_NUM_RATES + 1)) {
  		new_rate = clk_round_rate(dac->sample_clk, 256 * new_rate);
-		if (new_rate < 0)
+		if (new_rate <= 0)
  			break;
  		/* make sure we are below the ABDAC clock */
  		if (index < MAX_NUM_RATES &&
--
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