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Commit 1083206f authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: ice1724 - Fix TX IRQ lockup 



MPU TX causes IRQ floods on VT172x devices mysteriously.
Disable TX IRQ if the IRQ flood is detected.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent c872e8ca

sound/pci/ice1712/ice1724.c

+12 −8
Original line number Diff line number Diff line
@@ -382,23 +382,25 @@ static irqreturn_t snd_vt1724_interrupt(int irq, void *dev_id) 
	unsigned char status_mask =

		VT1724_IRQ_MPU_RX | VT1724_IRQ_MPU_TX | VT1724_IRQ_MTPCM;

	int handled = 0;

#ifdef CONFIG_SND_DEBUG

	int timeout = 0;

#endif



	while (1) {

		status = inb(ICEREG1724(ice, IRQSTAT));

		status &= status_mask;

		if (status == 0)

			break;

#ifdef CONFIG_SND_DEBUG

		if (++timeout > 10) {

			printk(KERN_ERR

			       "ice1724: Too long irq loop, status = 0x%x\n",

			       status);

			status = inb(ICEREG1724(ice, IRQSTAT));

			printk(KERN_ERR "ice1724: Too long irq loop, "

			       "status = 0x%x\n", status);

			if (status & VT1724_IRQ_MPU_TX) {

				printk(KERN_ERR "ice1724: Disabling MPU_TX\n");

				outb(inb(ICEREG1724(ice, IRQMASK)) &

				     ~VT1724_IRQ_MPU_TX,

				     ICEREG1724(ice, IRQMASK));

			}

			break;

		}

#endif

		handled = 1;

		if (status & VT1724_IRQ_MPU_TX) {

			spin_lock(&ice->reg_lock);
@@ -2351,7 +2353,7 @@ static int __devinit snd_vt1724_create(struct snd_card *card, 
{

	struct snd_ice1712 *ice;

	int err;

	unsigned char mask;

	/* unsigned char mask; */

	static struct snd_device_ops ops = {

		.dev_free =	snd_vt1724_dev_free,

	};
@@ -2413,8 +2415,10 @@ static int __devinit snd_vt1724_create(struct snd_card *card, 
	}



	/* unmask used interrupts */

#if 0 /* these are enabled/disabled dynamically */

	mask = VT1724_IRQ_MPU_RX | VT1724_IRQ_MPU_TX;

	outb(mask, ICEREG1724(ice, IRQMASK));

#endif

	/* don't handle FIFO overrun/underruns (just yet),

	 * since they cause machine lockups

	 */