rtmutex: Preserve TASK_STOPPED state when blocking on a "spin_lock"

When a process handles a SIGSTOP signal, it will set the state to
TASK_STOPPED, acquire tasklist_lock and notifiy the parent of the
status change. But in the rt kernel the process state will change
to TASK_UNINTERRUPTIBLE if it blocks on the tasklist_lock. So if
we send a SIGCONT signal to this process at this time, the SIGCONT
signal just does nothing because this process is not in TASK_STOPPED
state. Of course this is not what we wanted. Preserving the
TASK_STOPPED state when blocking on a "spin_lock" can fix this bug.

Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
LKML-Reference: <18e240905fcfd72457930322ee187e7ff9313aec.1267566249.git.paul.gortmaker@windriver.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

0 files changed, 0 insertions, 0 deletions