serial: Take care starting a hung-up tty's port

tty_port_hangup sets a port's tty field to NULL (holding the port lock),
but uart_tx_stopped, called from __uart_start (with the port lock),
uses the tty field without checking for NULL.

Change uart_tx_stopped to treat a NULL tty field as another stopped
indication.

Signed-off-by: Phil Elwell <[email protected]>

pinctrl-bcm2835: Fix cut-and-paste error in "pull" parsing

The DT bindings for pinctrl-bcm2835 allow both the function and pull
to contain either one entry or one per pin. However, an error in the
DT parsing can cause failures if the number of pulls differs from the
number of functions.

Merge remote-tracking branch 'stable/linux-4.1.y' into rpi-4.1.y

Merge remote-tracking branch 'stable/linux-4.1.y' into rpi-4.1.y