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ALSA: sb: Force to disable DMAs once when DMA mode is changed

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[ Upstream commit 4c267ae2ef349639b4d9ebf00dd28586a82fdbe6 ]

When the DMA mode is changed on the (still real!) SB AWE32 after
playing a stream and closing, the previous DMA setup was still
silently kept, and it can confuse the hardware, resulting in the
unexpected noises.  As a workaround, enforce the disablement of DMA
setups when the DMA setup is changed by the kcontrol.

https://bugzilla.kernel.org/show_bug.cgi?id=218185
Link: https://patch.msgid.link/20250610064322.26787-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Takashi Iwai 2025-06-10 08:43:20 +02:00 • committed by Greg Kroah-Hartman
commit 78c0ba1d1c
1 changed files with 4 additions and 0 deletions
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4
sound/isa/sb/sb16_main.c
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@ -722,6 +722,10 @@ static int snd_sb16_dma_control_put(struct snd_kcontrol *kcontrol, struct snd_ct
change = nval != oval;
snd_sb16_set_dma_mode(chip, nval);
spin_unlock_irqrestore(&chip->reg_lock, flags);
if (change) {
snd_dma_disable(chip->dma8);
snd_dma_disable(chip->dma16);
}
return change;
}