linux-kernel - Re: [1/2] 2.6.21-rc7: known regressions

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Date:	Tue, 17 Apr 2007 12:09:04 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>, perex@...e.cz,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [1/2] 2.6.21-rc7: known regressions

At Mon, 16 Apr 2007 17:44:57 -0400,
Chuck Ebbert wrote:
> 
> Adrian Bunk wrote:
> 
> > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > 
> > Subject    : snd_intel8x0: divide error: 0000
> > References : http://lkml.org/lkml/2007/3/5/252
> > Submitter  : Michal Piotrowski <michal.k.k.piotrowski@...il.com>
> > Status     : unknown
> > 
> 
> Oops is in sound/pci/intel8x0.c::snd_intel8x0_update(), part of
> the interrupt handler:
> 
> Line 751:
> 
>         ichdev->position += step * ichdev->fragsize1;
>         if (! chip->in_measurement)
>                 ichdev->position %= ichdev->size;
> 
> ichdev->size is 0. Interrupt happened upon request_irq().
> 
> Does chip->in_measurement need to be reset because this is a
> crashdump kernel?

No, the problem seems to be the timing of request_irq() and the
initialization of hardware.  The irq handler shouldn't get called
there at all.

How about the patch below?


Takashi

diff -r 4b6ed4ef4820 sound/pci/intel8x0.c
--- a/sound/pci/intel8x0.c	Mon Apr 16 19:20:17 2007 +0200
+++ b/sound/pci/intel8x0.c	Tue Apr 17 11:02:49 2007 +0200
@@ -2493,6 +2493,7 @@ static int intel8x0_resume(struct pci_de
 		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_de
 	}
 	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
 		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:
@@ -2900,6 +2891,15 @@ static int __devinit snd_intel8x0_create
 		snd_intel8x0_free(chip);
 		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);
-
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