Commit 93857edd authored Mar 30, 2017 by Johan Hovold Committed by Greg Kroah-Hartman Mar 31, 2017

tty: reset termios state on device registration



Free any saved termios data when registering a tty device so that the
termios state is reset when reusing a minor number.

This is useful for hot-pluggable buses such as USB where it does not
make much sense to reuse saved termios data from an unrelated device
when a new device is later plugged in.

This specifically avoids a situation where the new device does not have
the carrier-detect signal wired, but the saved termios state has CLOCAL
cleared, effectively preventing the port from being opened in blocking
mode as noted by Jan Kundrát <jan.kundrat@cesnet.cz>.

Note that clearing the saved data at deregistration would not work as
the device could still be open.

Also note that the termios data is not reset for drivers with
TTY_DRIVER_DYNAMIC_ALLOC set (e.g. legacy pty) as their character device
is registered at driver registration and could theoretically already
have been opened (and pty termios state is never saved anyway).

Reported-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 16b00ae8

drivers/tty/tty_io.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -3293,6 +3293,7 @@ struct device tty_register_device_attr(struct tty_driver driver,
		{
		char name[64];
		dev_t devt = MKDEV(driver->major, driver->minor_start) + index;
		struct ktermios *tp;
		struct device *dev;
		int retval;

		@@ -3326,6 +3327,16 @@ struct device tty_register_device_attr(struct tty_driver driver,
		goto err_put;

		if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
		/*
		* Free any saved termios data so that the termios state is
		* reset when reusing a minor number.
		*/
		tp = driver->termios[index];
		if (tp) {
		driver->termios[index] = NULL;
		kfree(tp);
		}

		retval = tty_cdev_add(driver, devt, index, 1);
		if (retval)
		goto err_del;

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