[ALSA] hda-intel - Fix pci_disable_msi() call

Fix the order to call pci_disable_msi() to be after free_irq().
(Otherwise pci_disable_msi() bugs you.)
Also, added a description of disable_msi option to documentation.

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

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -758,6 +758,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size)
     single_cmd  - Use single immediate commands to communicate with
 		codecs (for debugging only)
+    disable_msi - Disable Message Signaled Interrupt (MSI)
 
     This module supports one card and autoprobe.
 

sound/pci/hda/hda_intel.c

@@ -1422,8 +1422,9 @@ static int azx_free(struct azx *chip)
 	}
 
 	if (chip->irq >= 0) {
-		pci_disable_msi(chip->pci);
 		free_irq(chip->irq, (void*)chip);
+		if (!disable_msi)
+			pci_disable_msi(chip->pci);
 	}
 	if (chip->remap_addr)
 		iounmap(chip->remap_addr);