From c6b76d1f02e2ab1109d8549877a3a24c6a2b4587 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 16 Mar 2012 09:54:00 +0100 Subject: [PATCH] ALSA: au88x0 - Avoid possible Oops at unbinding The irq handler must check whether the MPU401 instance is still alive. Signed-off-by: Takashi Iwai --- sound/pci/au88x0/au88x0_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/pci/au88x0/au88x0_core.c b/sound/pci/au88x0/au88x0_core.c index 1181c5ec2d4f..525f881f0409 100644 --- a/sound/pci/au88x0/au88x0_core.c +++ b/sound/pci/au88x0/au88x0_core.c @@ -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; -- 2.20.1