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authorGeert Uytterhoeven <geert+renesas@glider.be>2016-04-14 12:08:10 +0300
committerJonathan Corbet <corbet@lwn.net>2016-04-16 00:59:12 +0300
commit18717b06ee4897c2cc5e92783386c4b304b9fce9 (patch)
treea01b932aae17683aea65600c72eb7422730af5c2 /Documentation/serial
parenta3bedc3bdc6e640141157636e253d63279860e23 (diff)
downloadlinux-18717b06ee4897c2cc5e92783386c4b304b9fce9.tar.xz
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>
Diffstat (limited to 'Documentation/serial')
-rw-r--r--Documentation/serial/driver6
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index 03b703cf9318..7fb80682e394 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -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.