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656d912537
The 3215 driver calls tty_wakeup from irq context while holding the device spinlock. If printk is called by any function on the callchain starting from tty_wakeup the system deadlocks on the device spinlock. Using a tasklet to call tty_wakup solves the problem. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>