ALSA: au88x0 - Avoid possible Oops at unbinding
The irq handler must check whether the MPU401 instance is still alive. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -2477,7 +2477,7 @@ static irqreturn_t vortex_interrupt(int irq, void *dev_id)
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hwread(vortex->mmio, VORTEX_IRQ_STAT);
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handled = 1;
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}
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if (source & IRQ_MIDI) {
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if ((source & IRQ_MIDI) && vortex->rmidi) {
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snd_mpu401_uart_interrupt(vortex->irq,
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vortex->rmidi->private_data);
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handled = 1;
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