X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Fserial%2Fdriver;h=77ba0afbe4db2c227650441af43ab3c57f2e5a6f;hb=45d866e1a06dba309f79dbb61ad1db964bb8ee8a;hp=88ad615dd338d75e2b282422c8f2d6f7f3af80b7;hpb=35a5d9ed9fedb74c22cb19ff7d749289473144e0;p=linux-2.6

diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index 88ad615dd3..77ba0afbe4 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -186,6 +186,17 @@ hardware.
 	Locking: port_sem taken.
 	Interrupts: caller dependent.
 
+  flush_buffer(port)
+	Flush any write buffers, reset any DMA state and stop any
+	ongoing DMA transfers.
+
+	This will be called whenever the port->info->xmit circular
+	buffer is cleared.
+
+	Locking: port->lock taken.
+	Interrupts: locally disabled.
+	This call must not sleep
+
   set_termios(port,termios,oldtermios)
 	Change the port parameters, including word length, parity, stop
 	bits.  Update read_status_mask and ignore_status_mask to indicate