From c2503cd3be9eacb1dd06ec5b6fba8bb06aac12a8 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Thu, 5 Mar 2009 09:37:40 +0100
Subject: ALSA: hdsp - Ignore MIDI and PCM events in interrupts until
initialized
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>
---
sound/pci/rme9652/hdsp.c | 3 +++
1 file changed, 3 insertions(+)
(limited to 'sound/pci/rme9652/hdsp.c')
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index dc65fe1c9c65..314e73531bd1 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -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);
--
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