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s390/3270: fix use after free of tty3270_screen structure
The deactivation and freeing of the tty view of the 3270 device can race with a tty3270_update invocation via the update timer. To fix this move the del_timer_sync call for the update timer from tty3270_free_view to tty3270_free prior to the tty3270_free_screen call. Signed-off-by: Martin Schwidefsky <[email protected]>
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