USB: serial: handle Data Carrier Detect changes
authorLibor Pechacek <lpechacek@suse.cz>
Fri, 14 Jan 2011 13:30:21 +0000 (14:30 +0100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Sun, 23 Jan 2011 02:53:26 +0000 (18:53 -0800)
commitd14fc1a74e846d7851f24fc9519fe87dc12a1231
tree9d014b0200d4f2ba94c6d5ed1002c46027147fae
parentca9cfea09fc5802074f79d086547c6363ddc894b
USB: serial: handle Data Carrier Detect changes

Alan's commit 335f8514f200e63d689113d29cb7253a5c282967 introduced
.carrier_raised function in several drivers.  That also means
tty_port_block_til_ready can now suspend the process trying to open the serial
port when Carrier Detect is low and put it into tty_port.open_wait queue.  We
need to wake up the process when Carrier Detect goes high and trigger TTY
hangup when CD goes low.

Some of the devices do not report modem status line changes, or at least we
don't understand the status message, so for those we remove .carrier_raised
again.

Signed-off-by: Libor Pechacek <lpechacek@suse.cz>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/serial/ch341.c
drivers/usb/serial/cp210x.c
drivers/usb/serial/digi_acceleport.c
drivers/usb/serial/generic.c
drivers/usb/serial/keyspan_pda.c
drivers/usb/serial/pl2303.c
drivers/usb/serial/spcp8x5.c
include/linux/usb/serial.h