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tty: Convert tty_struct bitfield to ints
The stopped, hw_stopped, flow_stopped and packet bits are smp-unsafe and interrupt-unsafe. For example, CPU 0 | CPU 1 | tty->flow_stopped = 1 | tty->hw_stopped = 0 One of these updates will be corrupted, as the bitwise operation on the bitfield is non-atomic. Ensure each flag has a separate memory location, so concurrent updates do not corrupt orthogonal states. Because DEC Alpha EV4 and EV5 cpus (from 1995) perform RMW on smaller-than-machine-word storage, "separate memory location" must be int instead of byte. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -261,7 +261,10 @@ struct tty_struct {
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unsigned long flags;
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int count;
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struct winsize winsize; /* winsize_mutex */
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unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
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int stopped;
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int flow_stopped;
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int hw_stopped;
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int packet;
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unsigned char ctrl_status; /* ctrl_lock */
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unsigned int receive_room; /* Bytes free for queue */
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int flow_change;
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