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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2016-10-28 07:07:47 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-28 08:13:07 -0400 |
| commit | 4dda864d73079a1eb01fab4ec29b97db150163bf (patch) | |
| tree | e44f9cc78700fc39ee8b7b453b06c1e524f54ed9 /drivers/tty | |
| parent | 9bcffe7575b721d7b6d9b3090fe18809d9806e78 (diff) | |
| download | linux-4dda864d73079a1eb01fab4ec29b97db150163bf.tar.gz linux-4dda864d73079a1eb01fab4ec29b97db150163bf.tar.bz2 linux-4dda864d73079a1eb01fab4ec29b97db150163bf.zip | |
tty: serial_core: Fix serial console crash on port shutdown
The port->console flag is always false, as uart_console() is called
before the serial console has been registered.
Hence for a serial port used as the console, uart_tty_port_shutdown()
will still be called when userspace closes the port, powering it down.
This may lead to a system lock up when the serial console driver writes
to the serial port's registers.
To fix this, move the setting of port->console after the call to
uart_configure_port(), which registers the serial console.
Fixes: 761ed4a94582ab29 ("tty: serial_core: convert uart_close to use tty_port_close")
Reported-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Mugunthan V N <mugunthanvnm@ti.com>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
[robh: rebased on tty-linus]
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 664c99aeeca5..ce8899c13af3 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2759,6 +2759,8 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) uart_configure_port(drv, state, uport); + port->console = uart_console(uport); + num_groups = 2; if (uport->attr_group) num_groups++; |