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-rw-r--r--drivers/serial/8250_pci.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/serial/8250_pci.c b/drivers/serial/8250_pci.c
index fd76542c597..e3140e5b16c 100644
--- a/drivers/serial/8250_pci.c
+++ b/drivers/serial/8250_pci.c
@@ -1652,6 +1652,10 @@ static struct pciserial_board pci_boards[] __devinitdata = {
},
};
+static const struct pci_device_id softmodem_blacklist[] = {
+ { PCI_VDEVICE ( AL, 0x5457 ), }, /* ALi Corporation M5457 AC'97 Modem */
+};
+
/*
* Given a complete unknown PCI device, try to use some heuristics to
* guess what the configuration might be, based on the pitiful PCI
@@ -1660,6 +1664,7 @@ static struct pciserial_board pci_boards[] __devinitdata = {
static int __devinit
serial_pci_guess_board(struct pci_dev *dev, struct pciserial_board *board)
{
+ const struct pci_device_id *blacklist;
int num_iomem, num_port, first_port = -1, i;
/*
@@ -1674,6 +1679,18 @@ serial_pci_guess_board(struct pci_dev *dev, struct pciserial_board *board)
(dev->class & 0xff) > 6)
return -ENODEV;
+ /*
+ * Do not access blacklisted devices that are known not to
+ * feature serial ports.
+ */
+ for (blacklist = softmodem_blacklist;
+ blacklist < softmodem_blacklist + ARRAY_SIZE(softmodem_blacklist);
+ blacklist++) {
+ if (dev->vendor == blacklist->vendor &&
+ dev->device == blacklist->device)
+ return -ENODEV;
+ }
+
num_iomem = num_port = 0;
for (i = 0; i < PCI_NUM_BAR_RESOURCES; i++) {
if (pci_resource_flags(dev, i) & IORESOURCE_IO) {