Re: [PATCH] isdn: i4l: isdn_tty: Fix some concurrency double-free bugs

From: Jia-Ju Bai <redacted>
Date: Tue,  8 Jan 2019 21:04:48 +0800

The functions isdn_tty_tiocmset() and isdn_tty_set_termios() may be
concurrently executed.

 ...

These possible bugs are found by a static tool written by myself and 
my manual code review.

To fix these possible bugs, the mutex lock "modem_info_mutex" used in
isdn_tty_tiocmset() is added in isdn_tty_set_termios().

Signed-off-by: Jia-Ju Bai <redacted>

Applied.