ALSA: hda/realtek - Allow NULL bus->pci

Realtek codec driver contains some codes referring to the PCI
subdevice IDs, but most of them are optional, typically for checking
the codec name variants.  Add NULL checks appropriately so that it can
work without PCI assignment.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -395,6 +395,8 @@ static int alc_auto_parse_customize_define(struct hda_codec *codec)
 		goto do_sku;
 	}
 
+	if (!codec->bus->pci)
+		return -1;
 	ass = codec->subsystem_id & 0xffff;
 	if (ass != codec->bus->pci->subsystem_device && (ass & 1))
 		goto do_sku;
@@ -483,7 +485,8 @@ static int alc_subsystem_id(struct hda_codec *codec, const hda_nid_t *ports)
 	}
 
 	ass = codec->subsystem_id & 0xffff;
-	if ((ass != codec->bus->pci->subsystem_device) && (ass & 1))
+	if (codec->bus->pci &&
+	    ass != codec->bus->pci->subsystem_device && (ass & 1))
 		goto do_sku;
 
 	/* invalid SSID, check the special NID pin defcfg instead */
@@ -966,6 +969,8 @@ static int alc_codec_rename_from_preset(struct hda_codec *codec)
 			return alc_codec_rename(codec, p->name);
 	}
 
+	if (!codec->bus->pci)
+		return 0;
 	for (q = rename_pci_tbl; q->codec_vendor_id; q++) {
 		if (q->codec_vendor_id != codec->vendor_id)
 			continue;
@@ -4502,13 +4507,15 @@ static int patch_alc269(struct hda_codec *codec)
 		spec->codec_variant = ALC269_TYPE_ALC269VA;
 		switch (alc_get_coef0(codec) & 0x00f0) {
 		case 0x0010:
-			if (codec->bus->pci->subsystem_vendor == 0x1025 &&
+			if (codec->bus->pci &&
+			    codec->bus->pci->subsystem_vendor == 0x1025 &&
 			    spec->cdefine.platform_type == 1)
 				err = alc_codec_rename(codec, "ALC271X");
 			spec->codec_variant = ALC269_TYPE_ALC269VB;
 			break;
 		case 0x0020:
-			if (codec->bus->pci->subsystem_vendor == 0x17aa &&
+			if (codec->bus->pci &&
+			    codec->bus->pci->subsystem_vendor == 0x17aa &&
 			    codec->bus->pci->subsystem_device == 0x21f3)
 				err = alc_codec_rename(codec, "ALC3202");
 			spec->codec_variant = ALC269_TYPE_ALC269VC;
@@ -5309,7 +5316,7 @@ static int patch_alc662(struct hda_codec *codec)
 		spec->gen.beep_nid = 0x01;
 
 	if ((alc_get_coef0(codec) & (1 << 14)) &&
-	    codec->bus->pci->subsystem_vendor == 0x1025 &&
+	    codec->bus->pci && codec->bus->pci->subsystem_vendor == 0x1025 &&
 	    spec->cdefine.platform_type == 1) {
 		err = alc_codec_rename(codec, "ALC272X");
 		if (err < 0)