From: Takashi Iwai <tiwai@suse.de>
Date: Thu, 5 Mar 2009 08:37:40 +0000 (+0100)
Subject: ALSA: hdsp - Ignore MIDI and PCM events in interrupts until initialized
X-Git-Tag: v2.6.30-rc1~676^2~11^2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c2503cd3be9eacb1dd06ec5b6fba8bb06aac12a8;p=karo-tx-linux.git

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>
---

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);