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serial: doc: .(un)throttle() are serialized by the tty layer 

Document that .(un)throttle() are serialized with each other, and with
termios modification by the tty layer.

Reported-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Geert Uytterhoeven 2016-04-14 11:08:10 +02:00 committed by Jonathan Corbet
parent a3bedc3bdc
commit 18717b06ee
1 changed files with 4 additions and 2 deletions
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Documentation/serial/driver
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@ -137,7 +137,8 @@ hardware.
should be sent to the serial port.
This will be called only if hardware assisted flow control is enabled.
Locking: none.
Locking: serialized with .unthrottle() and termios modification by the
tty layer.
unthrottle(port)
Notify the serial driver that characters can now be sent to the serial
@ -145,7 +146,8 @@ hardware.
disciplines.
This will be called only if hardware assisted flow control is enabled.
Locking: none.
Locking: serialized with .throttle() and termios modification by the
tty layer.
send_xchar(port,ch)
Transmit a high priority character, even if the port is stopped.