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serial: core: replace current->state by __set_current_state()

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Use helper functions to access current->state.
Direct assignments are prone to races and therefore buggy.

Thanks to Peter Zijlstra for the exact definition of the problem.

Suggested-By: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabian Frederick 2015-02-20 19:12:57 +01:00 committed by Greg Kroah-Hartman
parent 5dcb34bbc3
commit 97f9f707d2
1 changed files with 1 additions and 2 deletions
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3
drivers/tty/serial/serial_core.c
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@ -1118,8 +1118,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg)
cprev = cnow;
}
current->state = TASK_RUNNING;
__set_current_state(TASK_RUNNING);
remove_wait_queue(&port->delta_msr_wait, &wait);
return ret;