Searched hist:"8 a8dabf2dd68caff842d38057097c23bc514ea6e" (Results 1 – 3 of 3) sorted by relevance
/linux/drivers/tty/ |
H A D | n_null.c | 8a8dabf2dd68caff842d38057097c23bc514ea6e Fri Jun 02 14:49:30 CEST 2017 Alan Cox <alan@llwyncelyn.cymru> 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>
|
H A D | Makefile | diff 8a8dabf2dd68caff842d38057097c23bc514ea6e Fri Jun 02 14:49:30 CEST 2017 Alan Cox <alan@llwyncelyn.cymru> 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>
|
/linux/include/uapi/linux/ |
H A D | tty.h | diff 8a8dabf2dd68caff842d38057097c23bc514ea6e Fri Jun 02 14:49:30 CEST 2017 Alan Cox <alan@llwyncelyn.cymru> 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>
|