[PATCH] trident: fix pci_dev reference counting and buglet

Switch trident to use pci_get/put_dev properly.  Also fix a bug where the
driver erroneously passed pdev not NULL to a second search.  This happened
to always work except with pci=reverse because of chip ordering.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

sound/oss/trident.c

@@ -3269,8 +3269,8 @@ ali_setup_spdif_out(struct trident_card *card, int flag)
 	char temp;
 	struct pci_dev *pci_dev = NULL;
 
-	pci_dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, 
-				  pci_dev);
+	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
+				 pci_dev);
 	if (pci_dev == NULL)
 		return;
 	pci_read_config_byte(pci_dev, 0x61, &temp);
@@ -3284,6 +3284,8 @@ ali_setup_spdif_out(struct trident_card *card, int flag)
 	temp |= 0x10;
 	pci_write_config_byte(pci_dev, 0x7e, temp);
 
+	pci_dev_put(pci_dev);
+
 	ch = inb(TRID_REG(card, ALI_SCTRL));
 	outb(ch | ALI_SPDIF_OUT_ENABLE, TRID_REG(card, ALI_SCTRL));
 	ch = inb(TRID_REG(card, ALI_SPDIF_CTRL));
@@ -3490,16 +3492,19 @@ ali_close_multi_channels(void)
 	char temp = 0;
 	struct pci_dev *pci_dev = NULL;
 
-	pci_dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, 
-				  pci_dev);
+	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
+				 pci_dev);
 	if (pci_dev == NULL)
 		return -1;
+
 	pci_read_config_byte(pci_dev, 0x59, &temp);
 	temp &= ~0x80;
 	pci_write_config_byte(pci_dev, 0x59, temp);
 
-	pci_dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, 
-				  pci_dev);
+	pci_dev_put(pci_dev);
+
+	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,
+				 NULL);
 	if (pci_dev == NULL)
 		return -1;
 
@@ -3507,6 +3512,8 @@ ali_close_multi_channels(void)
 	temp &= ~0x20;
 	pci_write_config_byte(pci_dev, 0xB8, temp);
 
+	pci_dev_put(pci_dev);
+
 	return 0;
 }
 
@@ -3517,21 +3524,26 @@ ali_setup_multi_channels(struct trident_card *card, int chan_nums)
 	char temp = 0;
 	struct pci_dev *pci_dev = NULL;
 
-	pci_dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, 
-				  pci_dev);
+	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
+				 pci_dev);
 	if (pci_dev == NULL)
 		return -1;
 	pci_read_config_byte(pci_dev, 0x59, &temp);
 	temp |= 0x80;
 	pci_write_config_byte(pci_dev, 0x59, temp);
 
-	pci_dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, 
-				  pci_dev);
+	pci_dev_put(pci_dev);
+
+	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,
+				 NULL);
 	if (pci_dev == NULL)
 		return -1;
 	pci_read_config_byte(pci_dev, (int) 0xB8, &temp);
 	temp |= 0x20;
 	pci_write_config_byte(pci_dev, (int) 0xB8, (u8) temp);
+
+	pci_dev_put(pci_dev);
+
 	if (chan_nums == 6) {
 		dwValue = inl(TRID_REG(card, ALI_SCTRL)) | 0x000f0000;
 		outl(dwValue, TRID_REG(card, ALI_SCTRL));
@@ -4103,8 +4115,8 @@ ali_reset_5451(struct trident_card *card)
 	unsigned int dwVal;
 	unsigned short wCount, wReg;
 
-	pci_dev = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, 
-				  pci_dev);
+	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
+				 pci_dev);
 	if (pci_dev == NULL)
 		return -1;
 
@@ -4114,6 +4126,7 @@ ali_reset_5451(struct trident_card *card)
 	pci_read_config_dword(pci_dev, 0x7c, &dwVal);
 	pci_write_config_dword(pci_dev, 0x7c, dwVal & 0xf7ffffff);
 	udelay(5000);
+	pci_dev_put(pci_dev);
 
 	pci_dev = card->pci_dev;
 	if (pci_dev == NULL)
@@ -4393,7 +4406,7 @@ trident_probe(struct pci_dev *pci_dev, const struct pci_device_id *pci_id)
 
 	init_timer(&card->timer);
 	card->iobase = iobase;
-	card->pci_dev = pci_dev;
+	card->pci_dev = pci_dev_get(pci_dev);
 	card->pci_id = pci_id->device;
 	card->revision = revision;
 	card->irq = pci_dev->irq;
@@ -4547,6 +4560,7 @@ trident_probe(struct pci_dev *pci_dev, const struct pci_device_id *pci_id)
 out_free_irq:
 	free_irq(card->irq, card);
 out_proc_fs:
+	pci_dev_put(card->pci_dev);
 	if (res) {
 		remove_proc_entry("ALi5451", NULL);
 		res = NULL;
@@ -4597,9 +4611,9 @@ trident_remove(struct pci_dev *pci_dev)
 		}
 	unregister_sound_dsp(card->dev_audio);
 
-	kfree(card);
-
 	pci_set_drvdata(pci_dev, NULL);
+	pci_dev_put(card->pci_dev);
+	kfree(card);
 }
 
 MODULE_AUTHOR("Alan Cox, Aaron Holtzman, Ollie Lho, Ching Ling Lee, Muli Ben-Yehuda");