diff options
| author |   Aaron Sierra <asierra@xes-inc.com> | 2018-07-24 14:23:46 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-02 10:11:35 +0200 |
| commit | 60ab0fafc4b652fcaf7cbc3bb8555a0cf1149c28 (patch) | |
| tree | d00e2687c86207cfe27cdac3a85744aa35d109ce /drivers/tty/serial | |
| parent | tty: rocket: Fix possible buffer overwrite on register_PCI (diff) | |
| download | linux-dev-60ab0fafc4b652fcaf7cbc3bb8555a0cf1149c28.tar.xz linux-dev-60ab0fafc4b652fcaf7cbc3bb8555a0cf1149c28.zip | |
serial: 8250_exar: Read INT0 from slave device, too
The sleep wake-up refactoring that I introduced in
commit c7e1b4059075 ("tty: serial: exar: Relocate sleep wake-up handling")
did not account for devices with a slave device on the expansion port.
This patch pokes the INT0 register in the slave device, if present, in
order to ensure that MSI interrupts don't get permanently "stuck"
because of a sleep wake-up interrupt as described here:
commit 2c0ac5b48a35 ("serial: exar: Fix stuck MSIs")
This also converts an ioread8() to readb() in order to provide visual
consistency with the MMIO-only accessors used elsewhere in the driver.
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Fixes: c7e1b4059075 ("tty: serial: exar: Relocate sleep wake-up handling")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/8250/8250_exar.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index 7a98acd5e171..0089aa305ef9 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -445,7 +445,11 @@ static irqreturn_t exar_misc_handler(int irq, void *data) struct exar8250 *priv = data; /* Clear all PCI interrupts by reading INT0. No effect on IIR */ - ioread8(priv->virt + UART_EXAR_INT0); + readb(priv->virt + UART_EXAR_INT0); + + /* Clear INT0 for Expansion Interface slave ports, too */ + if (priv->board->num_ports > 8) + readb(priv->virt + 0x2000 + UART_EXAR_INT0); return IRQ_HANDLED; } |