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tty: make sure that proc_clear_tty stores the cpu flags 

proc_clear_tty() gets called with interrupts off (while holding the task list
lock) from sys_setid. This means that it needs the _irqsave version of the
locking primitives.

Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Tested-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arjan van de Ven 2008-10-15 10:52:34 +01:00 committed by Linus Torvalds
parent 6d54aaf389
commit 7c3b1dcf13
1 changed files with 3 additions and 2 deletions
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5
drivers/char/tty_io.c
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@ -3032,11 +3032,12 @@ EXPORT_SYMBOL(tty_devnum);
void proc_clear_tty(struct task_struct *p)
{
unsigned long flags;
struct tty_struct *tty;
spin_lock_irq(&p->sighand->siglock);
spin_lock_irqsave(&p->sighand->siglock, flags);
tty = p->signal->tty;
p->signal->tty = NULL;
spin_unlock_irq(&p->sighand->siglock);
spin_unlock_irqrestore(&p->sighand->siglock, flags);
tty_kref_put(tty);
}