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tty: Allow uart_register/unregister/register 

This is legitimate but because we don't clear the drv->state pointer in the
unregister code causes a bogus BUG().

Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=42880
Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Alan Cox 2012-05-14 14:51:22 +01:00 committed by Greg Kroah-Hartman
parent 1541f845d1
commit 1e66cded33
1 changed files with 1 additions and 0 deletions
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drivers/tty/serial/serial_core.c
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@ -2282,6 +2282,7 @@ void uart_unregister_driver(struct uart_driver *drv)
tty_unregister_driver(p);
put_tty_driver(p);
kfree(drv->state);
drv->state = NULL;
drv->tty_driver = NULL;
}