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-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.