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: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 8 deletions

diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
index 1b3f1170271..79a9cd0881f 100644
--- a/sound/pci/ice1712/ice1724.c
+++ b/sound/pci/ice1712/ice1724.c
@@ -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
          */