| From | Peter Hurley <> | Subject | [PATCH -next 12/27] tty: Document check_tty_count() requires tty_lock held | Date | Thu, 16 Oct 2014 16:25:10 -0400 |
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Holding the tty_lock() is necessary to prevent concurrent changes to the tty count that may cause it to differ from the open file list count. The tty_lock() is already held at all call sites.
NB: Note that the check for the pty master tty count is safe because the slave's tty_lock() is held while decrementing the pty master tty count.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com> --- drivers/tty/tty_io.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 50118ce..5c09cc4 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -275,6 +275,7 @@ int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, return 0; } +/* Caller must hold tty_lock */ static int check_tty_count(struct tty_struct *tty, const char *routine) { #ifdef CHECK_TTY_COUNT -- 2.1.1
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