diff options
| author | Dmitry Safonov <[email protected]> | 2018-11-01 00:24:48 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2018-12-05 12:16:33 +0100 |
| commit | c96cf923a98d1b094df9f0cf97a83e118817e31b (patch) | |
| tree | 600f4d868ef87ff58a642bb7e6d4825894d9c657 /scripts/stackusage | |
| parent | 83d817f41070c48bc3eb7ec18e43000a548fca5c (diff) | |
tty: Don't block on IO when ldisc change is pending
There might be situations where tty_ldisc_lock() has blocked, but there
is already IO on tty and it prevents line discipline changes.
It might theoretically turn into dead-lock.
Basically, provide more priority to pending tty_ldisc_lock() than to
servicing reads/writes over tty.
User-visible issue was reported by Mikulas where on pa-risc with
Debian 5 reboot took either 80 seconds, 3 minutes or 3:25 after proper
locking in tty_reopen().
Cc: Jiri Slaby <[email protected]>
Reported-by: Mikulas Patocka <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'scripts/stackusage')
0 files changed, 0 insertions, 0 deletions