From 324c1650ca2d6c1325afbb53d1187e63bbeaad0b Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Wed, 5 Nov 2014 12:12:56 -0500 Subject: [PATCH] tty: Simplify pty pair teardown logic When the slave side closes and its tty count is 0, the pty pair can be destroyed; the master side must have already closed for the slave side tty count to be 0. Thus, only the pty master close must check if the slave side has closed by checking the slave tty count. Remove the pre-computed closing flags and check the actual count(s). Regular ttys are unaffected by this change. Reviewed-by: Alan Cox Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_io.c | 29 ++++++++++------------------- 1 file changed, 10 insertions(+), 19 deletions(-) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index adbd9acf817f..ffa31c671a64 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1755,7 +1755,7 @@ int tty_release(struct inode *inode, struct file *filp) { struct tty_struct *tty = file_tty(filp); struct tty_struct *o_tty; - int pty_master, tty_closing, o_tty_closing, do_sleep; + int pty_master, do_sleep, final; int idx; char buf[64]; @@ -1797,18 +1797,15 @@ int tty_release(struct inode *inode, struct file *filp) * The test for the o_tty closing is necessary, since the master and * slave sides may close in any order. If the slave side closes out * first, its count will be one, since the master side holds an open. - * Thus this test wouldn't be triggered at the time the slave closes, + * Thus this test wouldn't be triggered at the time the slave closed, * so we do it now. */ tty_lock_pair(tty, o_tty); while (1) { - tty_closing = tty->count <= 1; - o_tty_closing = o_tty && - (o_tty->count <= (pty_master ? 1 : 0)); do_sleep = 0; - if (tty_closing) { + if (tty->count <= 1) { if (waitqueue_active(&tty->read_wait)) { wake_up_poll(&tty->read_wait, POLLIN); do_sleep++; @@ -1818,7 +1815,7 @@ int tty_release(struct inode *inode, struct file *filp) do_sleep++; } } - if (o_tty_closing) { + if (pty_master && o_tty->count <= 1) { if (waitqueue_active(&o_tty->read_wait)) { wake_up_poll(&o_tty->read_wait, POLLIN); do_sleep++; @@ -1836,14 +1833,6 @@ int tty_release(struct inode *inode, struct file *filp) schedule(); } - /* - * The closing flags are now consistent with the open counts on - * both sides, and we've completed the last operation that could - * block, so it's safe to proceed with closing. - * - * We must *not* drop the tty_mutex until we ensure that a further - * entry into tty_open can not pick up this tty. - */ if (pty_master) { if (--o_tty->count < 0) { printk(KERN_WARNING "%s: bad pty slave count (%d) for %s\n", @@ -1875,20 +1864,22 @@ int tty_release(struct inode *inode, struct file *filp) * processes that still think tty or o_tty is their controlling * tty. */ - if (tty_closing || o_tty_closing) { + if (!tty->count) { read_lock(&tasklist_lock); session_clear_tty(tty->session); - if (o_tty) + if (pty_master) session_clear_tty(o_tty->session); read_unlock(&tasklist_lock); } + /* check whether both sides are closing ... */ + final = !tty->count && !(pty_master && o_tty->count); + 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 */ - /* check whether both sides are closing ... */ - if (!tty_closing || (o_tty && !o_tty_closing)) + if (!final) return 0; #ifdef TTY_DEBUG_HANGUP -- 2.20.1