From: Giridhar Pemmasani <giri@lmc.cs.sunysb.edu>
It seems that pci config space is messed up after resume for Intel ICH4
audio controller (on Dell Latitude D600, but I notice that others also
complain about this problem). Consequently resume from S3 causes oops with
snd_intel8x0 module. If the module is removed before suspend and loaded
afterwards, I still get oops. The following simple patch fixes the
problem. With this, I can leave alsa untouched during suspend/resume.
---
25-akpm/sound/pci/intel8x0.c | 3 +++
1 files changed, 3 insertions(+)
diff -puN sound/pci/intel8x0.c~intel8x0-resume-fix sound/pci/intel8x0.c
--- 25/sound/pci/intel8x0.c~intel8x0-resume-fix 2004-04-17 23:14:12.980616680 -0700
+++ 25-akpm/sound/pci/intel8x0.c 2004-04-17 23:14:12.990615160 -0700
@@ -445,6 +445,7 @@ struct _snd_intel8x0 {
#ifdef CONFIG_PM
int in_suspend;
+ u32 pci_state[64 / sizeof(u32)];
#endif
};
@@ -2223,11 +2224,13 @@ static int snd_intel8x0_suspend(struct p
{
intel8x0_t *chip = snd_magic_cast(intel8x0_t, pci_get_drvdata(dev), return -ENXIO);
intel8x0_suspend(chip);
+ pci_save_state(dev, chip->pci_state);
return 0;
}
static int snd_intel8x0_resume(struct pci_dev *dev)
{
intel8x0_t *chip = snd_magic_cast(intel8x0_t, pci_get_drvdata(dev), return -ENXIO);
+ pci_restore_state(dev, chip->pci_state);
intel8x0_resume(chip);
return 0;
}
_