serial: 8250_exar: Bug fix for determination of number of ports for
Commtech PCIe cards
The following line is used to determine the number of ports for each exar
board in a/drivers/tty/serial/8250/8250_exar.c:589
nr_ports = board->num_ports ? board->num_ports : pcidev->device & 0x0f;
If the number of ports a card has is not explicitly specified, it defaults
to the rightmost 4 bits of the PCI device ID. This is prone to error since
not all PCI device IDs contain a number which corresponds to the number of
ports that card provides.
This particular case involves COMMTECH_4224PCIE and COMMTECH_4228PCIE
cards with device ID 0x0020 and 0x0021. Currently the multiport cards
receive 0 and 1 port instead of 4 and 8 ports respectively.
To fix this, each Commtech Fastcom PCIe card is given a struct where the
number of ports is explicitly specified. This ensures 'board->num_ports'
is used instead of the default 'pcidev->device & 0x0f'.
Signed-off-by: Valmer Huhn <valmer.huhn@xxxxxxxxxxxxxxxxx>
Tested-by: Valmer Huhn <valmer.huhn@xxxxxxxxxxxxxxxxx>
---
Thank you,
Valmer Huhn
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index ddb6aeb76dc5..793906afb0f6 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -734,6 +734,24 @@ static const struct exar8250_board pbn_exar_XR17V35x = {
.exit = pci_xr17v35x_exit,
};
+static const struct exar8250_board pbn_fastcom_XR17V352 = {
+ .num_ports = 2,
+ .setup = pci_xr17v35x_setup,
+ .exit = pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_fastcom_XR17V354 = {
+ .num_ports = 4,
+ .setup = pci_xr17v35x_setup,
+ .exit = pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_fastcom_XR17V358 = {
+ .num_ports = 8,
+ .setup = pci_xr17v35x_setup,
+ .exit = pci_xr17v35x_exit,
+};
+
static const struct exar8250_board pbn_exar_XR17V4358 = {
.num_ports = 12,
.setup = pci_xr17v35x_setup,
@@ -801,9 +819,9 @@ static const struct pci_device_id exar_pci_tbl[] = {
EXAR_DEVICE(EXAR, XR17V358, pbn_exar_XR17V35x),
EXAR_DEVICE(EXAR, XR17V4358, pbn_exar_XR17V4358),
EXAR_DEVICE(EXAR, XR17V8358, pbn_exar_XR17V8358),
- EXAR_DEVICE(COMMTECH, 4222PCIE, pbn_exar_XR17V35x),
- EXAR_DEVICE(COMMTECH, 4224PCIE, pbn_exar_XR17V35x),
- EXAR_DEVICE(COMMTECH, 4228PCIE, pbn_exar_XR17V35x),
+ EXAR_DEVICE(COMMTECH, 4222PCIE, pbn_fastcom_XR17V352),
+ EXAR_DEVICE(COMMTECH, 4224PCIE, pbn_fastcom_XR17V354),
+ EXAR_DEVICE(COMMTECH, 4228PCIE, pbn_fastcom_XR17V358),
EXAR_DEVICE(COMMTECH, 4222PCI335, pbn_fastcom335_2),
EXAR_DEVICE(COMMTECH, 4224PCI335, pbn_fastcom335_4),
