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authorPeter Hurley <peter@hurleysoftware.com>2014-06-16 09:16:58 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-10 16:05:19 -0700
commited617e44234ee03a60edbf0809f696f0b9cf1b90 (patch)
tree0c949737a7744541f91ed7131fc38d6ffdd897f3 /include/linux/tty_driver.h
parented9891bf093638fad29f89c10b536550d29b129d (diff)
tty: Document locking for tty driver methods
The tty core calls the tty driver's open, close and hangup methods holding the tty lock. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/tty_driver.h')
-rw-r--r--include/linux/tty_driver.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 756a60989294..e48c608a8fa8 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -35,14 +35,14 @@
* This routine is mandatory; if this routine is not filled in,
* the attempted open will fail with ENODEV.
*
- * Required method.
- *
+ * Required method. Called with tty lock held.
+ *
* void (*close)(struct tty_struct * tty, struct file * filp);
*
* This routine is called when a particular tty device is closed.
* Note: called even if the corresponding open() failed.
*
- * Required method.
+ * Required method. Called with tty lock held.
*
* void (*shutdown)(struct tty_struct * tty);
*
@@ -172,6 +172,8 @@
*
* Optional:
*
+ * Called with tty lock held.
+ *
* int (*break_ctl)(struct tty_struct *tty, int state);
*
* This optional routine requests the tty driver to turn on or