From: Oswald Buddenhagen oswald.buddenhagen@gmx.de
commit b09c551c77c7e01dc6e4f3c8bf06b5ffa7b06db5 upstream.
Due to two copy/pastos, closing the MIC or EFX capture device would make a running ADC capture hang due to unsetting its interrupt handler. In principle, this would have also allowed dereferencing dangling pointers, but we're actually rather thorough at disabling and flushing the ints.
While it may sound like one, this actually wasn't a hypothetical bug: PortAudio will open a capture stream at startup (and close it right away) even if not asked to. If the first device is busy, it will just proceed with the next one ... thus killing a concurrent capture.
Signed-off-by: Oswald Buddenhagen oswald.buddenhagen@gmx.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20230405201220.2197923-1-oswald.buddenhagen@gmx.de Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/pci/emu10k1/emupcm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/sound/pci/emu10k1/emupcm.c +++ b/sound/pci/emu10k1/emupcm.c @@ -1232,7 +1232,7 @@ static int snd_emu10k1_capture_mic_close { struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
- emu->capture_interrupt = NULL; + emu->capture_mic_interrupt = NULL; emu->pcm_capture_mic_substream = NULL; return 0; } @@ -1340,7 +1340,7 @@ static int snd_emu10k1_capture_efx_close { struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
- emu->capture_interrupt = NULL; + emu->capture_efx_interrupt = NULL; emu->pcm_capture_efx_substream = NULL; return 0; }