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tty: Check tty->count instead of TTY_CLOSING in tty_reopen()

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Although perhaps not obvious, the TTY_CLOSING bit is set when the
tty count has been decremented to 0 (which occurs while holding
tty_lock). The only other case when tty count is 0 during a re-open
is when a legacy BSD pty master has been opened in parallel but
after the pty slave, which is unsupported and returns an error.

Thus !tty->count contains the complete set of degenerate conditions
under which a tty open fails.

Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-11-05 12:12:48 -05:00 committed by Greg Kroah-Hartman
parent 5d93e74895
commit 216030ec55
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/tty_io.c
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@ -1452,7 +1452,7 @@ static int tty_reopen(struct tty_struct *tty)
{
struct tty_driver *driver = tty->driver;
if (test_bit(TTY_CLOSING, &tty->flags))
if (!tty->count)
return -EIO;
if (driver->type == TTY_DRIVER_TYPE_PTY &&