diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2014-06-16 09:17:02 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-10 16:05:19 -0700 |
| commit | 9c9928bded9b4e35326d608b636ac65ff16f0404 (patch) | |
| tree | dcfdc9255d7cde98c6efa579617f1bb945a42538 /drivers | |
| parent | c590f6b6cf04513c755b65bbeaf7bd1e88203bb0 (diff) | |
tty: Document locking for tty_port_hangup()
The tty lock is held when the tty driver's hangup() method is called
(from the lone call-site, __tty_hangup()). The call-tree audit [1]
of tty_port_hangup() is a closed graph of the callers of
tty_port_hangup(); ie., all callers originate only from __tty_hangup().
Of these callers, none drop the tty lock prior to calling
tty_port_hangup().
[1]
Call-tree audit of tty_port_hangup()
__tty_hangup()
tty->ops->hangup() --+
|
rs_hangup():arch/ia64/hp/sim/simserial.c
line_hangup():arch/um/drivers/line.c
gdm_tty_hangup():drivers/staging/gdm724x/gdm_tty.c
fwtty_hangup():drivers/staging/fwserial/fwserial.c
acm_tty_hangup():drivers/usb/class/cdc-acm.c
serial_hangup():drivers/usb/serial/usb-serial.c
ipoctal_hangup():drivers/ipack/devices/ipoctal.c
cy_hangup():drivers/tty/cyclades.c
isicom_hangup():drivers/tty/isicom.c
rp_hangup():drivers/tty/rocket.c
dashtty_hangup():drivers/tty/metag_da.c
moxa_hangup():drivers/tty/moxa.c
gsmtty_hangup():drivers/tty/n_gsm.c
goldfish_tty_hangup():drivers/tty/goldfish.c
ehv_bc_tty_hangup():drivers/tty/ehv_bytechan.c
mxser_hangup():drivers/tty/mxser.c
kgdb_nmi_tty_hangup():drivers/tty/serial/kgdb_nmi.c
ifx_spi_hangup():drivers/tty/serial/ifx6x60.c
ntty_hangup():drivers/tty/nozomi.c
capinc_tty_hangup():drivers/isdn/capi/capi.c
mgslpc_hangup():drivers/char/pcmcia/synclink_cs.c
sdio_uart_hangup():drivers/mmc/card/sdio_uart.c
rfcomm_tty_hangup():net/bluetooth/rfcomm/tty.c
|
+- tty_port_hangup()
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/tty_port.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index 69e072b5912..7309594e1c1 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -227,6 +227,8 @@ out: * * Perform port level tty hangup flag and count changes. Drop the tty * reference. + * + * Caller holds tty lock. */ void tty_port_hangup(struct tty_port *port) |