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ALSA: au88x0 - Avoid possible Oops at unbinding

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The irq handler must check whether the MPU401 instance is still alive.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-03-16 09:54:00 +01:00
parent 0717d0f5d2
commit c6b76d1f02
1 changed files with 1 additions and 1 deletions
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sound/pci/au88x0/au88x0_core.c
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@ -2477,7 +2477,7 @@ static irqreturn_t vortex_interrupt(int irq, void *dev_id)
hwread(vortex->mmio, VORTEX_IRQ_STAT);
handled = 1;
}
if (source & IRQ_MIDI) {
if ((source & IRQ_MIDI) && vortex->rmidi) {
snd_mpu401_uart_interrupt(vortex->irq,
vortex->rmidi->private_data);
handled = 1;