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authorDmitry Safonov <dima@arista.com>2019-01-09 01:17:40 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-11 17:03:42 +0100
commitd3736d82e8169768218ee0ef68718875918091a0 (patch)
tree0a7ee066b464a7a41104646d07a2513d95e89b76 /samples/hidraw
parentd3a28a53630e1ca10f59562ef560e3f70785cb09 (diff)
tty: Don't hold ldisc lock in tty_reopen() if ldisc present
Try to get reference for ldisc during tty_reopen(). If ldisc present, we don't need to do tty_ldisc_reinit() and lock the write side for line discipline semaphore. Effectively, it optimizes fast-path for tty_reopen(), but more importantly it won't interrupt ongoing IO on the tty as no ldisc change is needed. Fixes user-visible issue when tty_reopen() interrupted login process for user with a long password, observed and reported by Lukas. Fixes: c96cf923a98d ("tty: Don't block on IO when ldisc change is pending") Fixes: 83d817f41070 ("tty: Hold tty_ldisc_lock() during tty_reopen()") Cc: Jiri Slaby <jslaby@suse.com> Reported-by: Lukas F. Hartmann <lukas@mntmn.com> Tested-by: Lukas F. Hartmann <lukas@mntmn.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'samples/hidraw')
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