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| author | Alan Cox | 2017-06-02 14:49:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2017-06-03 11:43:46 +0200 |
| commit | 8a8dabf2dd68caff842d38057097c23bc514ea6e (patch) | |
| tree | 98e019474882e4f4ea47ac77e162c86f3540c726 /.gitattributes | |
| parent | tty: reserve N_SPEAKUP number (diff) | |
| download | kernel-qcow2-linux-8a8dabf2dd68caff842d38057097c23bc514ea6e.tar.gz kernel-qcow2-linux-8a8dabf2dd68caff842d38057097c23bc514ea6e.tar.xz kernel-qcow2-linux-8a8dabf2dd68caff842d38057097c23bc514ea6e.zip | |
tty: handle the case where we cannot restore a line discipline
Historically the N_TTY driver could never fail but this has become broken over
time. Rather than trying to rewrite half the ldisc layer to fix the breakage
introduce a second level of fallback with an N_NULL ldisc which cannot fail,
and thus restore the guarantees required by the ldisc layer.
We still try and fail to N_TTY first. It's much more useful to find yourself
back in your old ldisc (first attempt) or in N_TTY (second attempt), and while
I'm not aware of any code out there that makes those assumptions it's good to
drive(r) defensively.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to '.gitattributes')
0 files changed, 0 insertions, 0 deletions