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ALSA: atmel_abdac: clk_round_rate() can return a zero upon error

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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@nvidia.com>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Paul Walmsley 2013-12-09 18:49:13 -08:00 committed by Takashi Iwai
parent f62438ac53
commit 337bb336b9
1 changed files with 1 additions and 1 deletions
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2
sound/atmel/abdac.c
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@ -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 (new_rate <= clk_get_rate(dac->pclk)) {