diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2014-11-05 20:12:53 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-06 05:30:43 +0300 |
| commit | 0911261d4cb614ef6900cd2906be2c61a87f43ff (patch) | |
| tree | 0d69b4db079286579460737708fbe732f032a24b /drivers/tty/tty_io.c | |
| parent | 04980706c8febe41ec598116b174bd3a2dc82355 (diff) | |
| download | linux-0911261d4cb614ef6900cd2906be2c61a87f43ff.tar.xz | |
tty: Don't take tty_mutex for tty count changes
Holding tty_mutex is no longer required to serialize changes to
the tty_count or to prevent concurrent opens of closing ttys;
tty_lock() is sufficient.
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>
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index ea8c6cae8d12..e59de81c39a9 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1804,10 +1804,6 @@ int tty_release(struct inode *inode, struct file *filp) * each iteration we avoid any problems. */ while (1) { - /* Guard against races with tty->count changes elsewhere and - opens on /dev/tty */ - - mutex_lock(&tty_mutex); tty_lock_pair(tty, o_tty); tty_closing = tty->count <= 1; o_tty_closing = o_tty && @@ -1840,7 +1836,6 @@ int tty_release(struct inode *inode, struct file *filp) printk(KERN_WARNING "%s: %s: read/write wait queue active!\n", __func__, tty_name(tty, buf)); tty_unlock_pair(tty, o_tty); - mutex_unlock(&tty_mutex); schedule(); } @@ -1891,7 +1886,6 @@ int tty_release(struct inode *inode, struct file *filp) read_unlock(&tasklist_lock); } - mutex_unlock(&tty_mutex); tty_unlock_pair(tty, o_tty); /* At this point, the tty->count == 0 should ensure a dead tty cannot be re-opened by a racing opener */ |