[ALSA] intel8x0 - Fix Oops in crash kernel

When intel8x0 driver is loaded in the crash kernel, it gets Oops
occasionally.  This is because the irq handler gets called before
the proper hardware initialization.  Now defer it after
snd_intel8x0_chip_init().
(reference: http://lkml.org/lkml/2007/3/5/252)

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index 7cf2dcb..202f720 100644 (file)
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -2493,6 +2493,7 @@ static int intel8x0_resume(struct pci_dev *pci)
                return -EIO;
        }
        pci_set_master(pci);
+       snd_intel8x0_chip_init(chip, 0);
        if (request_irq(pci->irq, snd_intel8x0_interrupt,
                        IRQF_SHARED, card->shortname, chip)) {
                printk(KERN_ERR "intel8x0: unable to grab IRQ %d, "
@@ -2502,7 +2503,6 @@ static int intel8x0_resume(struct pci_dev *pci)
        }
        chip->irq = pci->irq;
        synchronize_irq(chip->irq);
-       snd_intel8x0_chip_init(chip, 0);
 
        /* re-initialize mixer stuff */
        if (chip->device_type == DEVICE_INTEL_ICH4 && !spdif_aclink) {
@@ -2862,16 +2862,7 @@ static int __devinit snd_intel8x0_create(struct snd_card *card,
                ICH_REG_ALI_INTERRUPTSR : ICH_REG_GLOB_STA;
        chip->int_sta_mask = int_sta_masks;
 
-       /* request irq after initializaing int_sta_mask, etc */
-       if (request_irq(pci->irq, snd_intel8x0_interrupt,
-                       IRQF_SHARED, card->shortname, chip)) {
-               snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
-               snd_intel8x0_free(chip);
-               return -EBUSY;
-       }
-       chip->irq = pci->irq;
        pci_set_master(pci);
-       synchronize_irq(chip->irq);
 
        switch(chip->device_type) {
        case DEVICE_INTEL_ICH4:
@@ -2901,6 +2892,15 @@ static int __devinit snd_intel8x0_create(struct snd_card *card,
                return err;
        }
 
+       /* request irq after initializaing int_sta_mask, etc */
+       if (request_irq(pci->irq, snd_intel8x0_interrupt,
+                       IRQF_SHARED, card->shortname, chip)) {
+               snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
+               snd_intel8x0_free(chip);
+               return -EBUSY;
+       }
+       chip->irq = pci->irq;
+
        if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
                snd_intel8x0_free(chip);
                return err;