diff options
| author |   Valmer Huhn <valmer.huhn@concurrent-rt.com> | 2020-08-13 12:52:55 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-18 13:27:26 +0200 |
| commit | c6b9e95dde7b54e6a53c47241201ab5a4035c320 (patch) | |
| tree | 3c98bc26935a80555751b8a674b9543e95c58a26 /drivers/tty | |
| parent | tty: serial: qcom_geni_serial: Drop __init from qcom_geni_console_setup (diff) | |
| download | wireguard-linux-c6b9e95dde7b54e6a53c47241201ab5a4035c320.tar.xz wireguard-linux-c6b9e95dde7b54e6a53c47241201ab5a4035c320.zip | |
serial: 8250_exar: Fix number of ports for Commtech PCIe cards
The following in 8250_exar.c line 589 is used to determine the number
of ports for each Exar board:
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_4222PCIE, COMMTECH_4224PCIE and
COMMTECH_4228PCIE cards with device IDs 0x0022, 0x0020 and 0x0021.
Currently the multiport cards receive 2, 0 and 1 port instead of 2, 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'.
Fixes: d0aeaa83f0b0 ("serial: exar: split out the exar code from 8250_pci")
Signed-off-by: Valmer Huhn <valmer.huhn@concurrent-rt.com>
Tested-by: Valmer Huhn <valmer.huhn@concurrent-rt.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200813165255.GC345440@icarus.concurrent-rt.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_exar.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index 04b9af7ed941..2d0e7c7e408d 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -744,6 +744,24 @@ static const struct exar8250_board pbn_exar_XR17V35x = { .exit = pci_xr17v35x_exit, }; +static const struct exar8250_board pbn_fastcom35x_2 = { + .num_ports = 2, + .setup = pci_xr17v35x_setup, + .exit = pci_xr17v35x_exit, +}; + +static const struct exar8250_board pbn_fastcom35x_4 = { + .num_ports = 4, + .setup = pci_xr17v35x_setup, + .exit = pci_xr17v35x_exit, +}; + +static const struct exar8250_board pbn_fastcom35x_8 = { + .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, @@ -811,9 +829,9 @@ 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_fastcom35x_2), + EXAR_DEVICE(COMMTECH, 4224PCIE, pbn_fastcom35x_4), + EXAR_DEVICE(COMMTECH, 4228PCIE, pbn_fastcom35x_8), EXAR_DEVICE(COMMTECH, 4222PCI335, pbn_fastcom335_2), EXAR_DEVICE(COMMTECH, 4224PCI335, pbn_fastcom335_4), |