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ALSA: hdsp - Ignore MIDI and PCM events in interrupts until initialized

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Ignore MIDI and PCM events in the interrupt handler until the device
gets initialized properly.  Otherwise you may get kernel panic by the
access to uninitialized devices via hotplugging.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2009-03-05 09:37:40 +01:00
parent f9ffc5d6f0
commit c2503cd3be
1 changed files with 3 additions and 0 deletions
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sound/pci/rme9652/hdsp.c
+3
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@@ -3740,6 +3740,9 @@ static irqreturn_t snd_hdsp_interrupt(int irq, void *dev_id)
midi0status = hdsp_read (hdsp, HDSP_midiStatusIn0) & 0xff;
midi1status = hdsp_read (hdsp, HDSP_midiStatusIn1) & 0xff;
if (!(hdsp->state & HDSP_InitializationComplete))
return IRQ_HANDLED;
if (audio) {
if (hdsp->capture_substream)
snd_pcm_period_elapsed(hdsp->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);