patch to make suspend/resume work

[Giridhar Pemmasani <giri@lmc.cs.sunysb.edu>]

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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.


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--- intel8x0.c.orig	2004-04-15 17:19:56.000000000 -0400
+++ intel8x0.c	2004-04-15 17:20:55.000000000 -0400
@@ -445,6 +445,7 @@
 	
 #ifdef CONFIG_PM
 	int in_suspend;
+	u32 pci_state[64 / sizeof(u32)];
 #endif
 };
 
@@ -2223,11 +2224,13 @@
 {
 	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;
 }

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-- 
Giri