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| author | Rob Herring <robh@kernel.org> | 2016-09-09 17:37:02 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-15 12:37:09 +0200 |
| commit | a727b025f43d7952c0697562f5cecda9f42758aa (patch) | |
| tree | 6c47c8fc223593189222209490600615a0b333f3 /include/linux | |
| parent | e5e8960236dbff4b49eac1ec7f47b1c912531b62 (diff) | |
| download | lwn-a727b025f43d7952c0697562f5cecda9f42758aa.tar.gz lwn-a727b025f43d7952c0697562f5cecda9f42758aa.zip | |
tty: serial_core: add tty NULL check to uart_tx_stopped
Commit 761ed4a94582 ("tty: serial_core: convert uart_close to use
tty_port_close") created a case where a port used for a console does not
get shutdown on tty closing. Then a call to uart_tx_stopped() segfaults
because the tty is NULL. This could be fixed to restore old behavior,
but we also want to allow tty_ports to work without a tty attached. So
this change to allow a NULL tty_struct is needed either way.
Fixes: 761ed4a94582 ("tty: serial_core: convert uart_close to use tty_port_close")
Reported-by: kernel test robot <xiaolong.ye@intel.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/serial_core.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index cdba6f144f72..378d80a8dd43 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -412,7 +412,7 @@ int uart_resume_port(struct uart_driver *reg, struct uart_port *port); static inline int uart_tx_stopped(struct uart_port *port) { struct tty_struct *tty = port->state->port.tty; - if (tty->stopped || port->hw_stopped) + if ((tty && tty->stopped) || port->hw_stopped) return 1; return 0; } |