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| author | Lukas Wunner <lukas@wunner.de> | 2017-10-28 11:35:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-04 12:08:53 +0100 |
| commit | 3236a965486ba0c6043cf2c7b51943d8b382ae29 (patch) | |
| tree | 2cb4bcf7aba7809e963dbd03350b23ed87ce683a /drivers/tty | |
| parent | 9356335faf9f65568dbdb9bba2a07117f69d34c5 (diff) | |
| download | linux-3236a965486ba0c6043cf2c7b51943d8b382ae29.tar.gz linux-3236a965486ba0c6043cf2c7b51943d8b382ae29.tar.bz2 linux-3236a965486ba0c6043cf2c7b51943d8b382ae29.zip | |
serial: 8250_fintek: Fix rs485 disablement on invalid ioctl()
This driver's ->rs485_config callback checks if SER_RS485_RTS_ON_SEND
and SER_RS485_RTS_AFTER_SEND have the same value. If they do, it means
the user has passed in invalid data with the TIOCSRS485 ioctl()
since RTS must have a different polarity when sending and when not
sending. In this case, rs485 mode is not enabled (the RS485_URA bit
is not set in the RS485 Enable Register) and this is supposed to be
signaled back to the user by clearing the SER_RS485_ENABLED bit in
struct serial_rs485 ... except a missing tilde character is preventing
that from happening.
Fixes: 28e3fb6c4dce ("serial: Add support for Fintek F81216A LPC to 4 UART")
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Cc: "Ji-Ze Hong (Peter Hong)" <hpeter@gmail.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_fintek.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c index b34623914413..c41cbb52f1fe 100644 --- a/drivers/tty/serial/8250/8250_fintek.c +++ b/drivers/tty/serial/8250/8250_fintek.c @@ -221,7 +221,7 @@ static int fintek_8250_rs485_config(struct uart_port *port, if ((!!(rs485->flags & SER_RS485_RTS_ON_SEND)) == (!!(rs485->flags & SER_RS485_RTS_AFTER_SEND))) - rs485->flags &= SER_RS485_ENABLED; + rs485->flags &= ~SER_RS485_ENABLED; else config |= RS485_URA; |