From: Christian Schmidt <[email protected]>
The serial_pci driver tries to guess serial ports on unknown devices based
on the PCI class (modem or serial). On certain softmodems (AC'97 modems)
this can lead to the recognition of non-existing serial ports.
This patch adds a blacklist of PCI IDs that are to be ignored by the driver.
[[email protected]: cleanups]
Signed-off-by: Christian Schmidt <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Russell King <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Alan Cox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/serial/8250_pci.c | 17 +++++++++++++++++
1 files changed, 17 insertions(+)
diff -puN drivers/serial/8250_pci.c~add-blacklisting-capability-to-serial_pci-to-avoid-misdetection drivers/serial/8250_pci.c
--- a/drivers/serial/8250_pci.c~add-blacklisting-capability-to-serial_pci-to-avoid-misdetection
+++ a/drivers/serial/8250_pci.c
@@ -1652,6 +1652,10 @@ static struct pciserial_board pci_boards
},
};
+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
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 *d
(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) {
_
-
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