diff options
| author | NeilBrown <neilb@suse.com> | 2015-09-05 11:07:04 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.com> | 2015-09-05 11:08:32 +0200 |
| commit | e89c6fdf9e0eb1b5a03574d4ca73e83eae8deb91 (patch) | |
| tree | f9df292ed03a5a3c4ddc658ae3646f02a1ffafce /drivers/tty/n_tty.c | |
| parent | c3cce6cda162eb2b2960a85d9c8992f4f3be85d0 (diff) | |
| parent | 1081230b748de8f03f37f80c53dfa89feda9b8de (diff) | |
Merge linux-block/for-4.3/core into md/for-linux
There were a few conflicts that are fairly easy to resolve.
Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/tty/n_tty.c')
| -rw-r--r-- | drivers/tty/n_tty.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index ee8bfacf2071..20932cc9c8f7 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -2147,6 +2147,8 @@ extern ssize_t redirected_tty_write(struct file *, const char __user *, static int job_control(struct tty_struct *tty, struct file *file) { + struct pid *pgrp; + /* Job control check -- must be done at start and after every sleep (POSIX.1 7.1.1.4). */ /* NOTE: not yet done after every sleep pending a thorough @@ -2156,18 +2158,25 @@ static int job_control(struct tty_struct *tty, struct file *file) current->signal->tty != tty) return 0; + rcu_read_lock(); + pgrp = task_pgrp(current); + spin_lock_irq(&tty->ctrl_lock); if (!tty->pgrp) printk(KERN_ERR "n_tty_read: no tty->pgrp!\n"); - else if (task_pgrp(current) != tty->pgrp) { + else if (pgrp != tty->pgrp) { spin_unlock_irq(&tty->ctrl_lock); - if (is_ignored(SIGTTIN) || is_current_pgrp_orphaned()) + if (is_ignored(SIGTTIN) || is_current_pgrp_orphaned()) { + rcu_read_unlock(); return -EIO; - kill_pgrp(task_pgrp(current), SIGTTIN, 1); + } + kill_pgrp(pgrp, SIGTTIN, 1); + rcu_read_unlock(); set_thread_flag(TIF_SIGPENDING); return -ERESTARTSYS; } spin_unlock_irq(&tty->ctrl_lock); + rcu_read_unlock(); return 0; } |