Hi all,
Three fixes that worth to have in the @stable, as we've hit them on v4.9
stable.
And for linux-next - adding lockdep asserts for line discipline changing
code, verifying that write ldisc sem will be held forthwith.
The last patch is optional and probably, timeout can be dropped for
read_lock(). I'll do it if everyone agrees.
Rong Chen, could you kindly re-run this version to see if the lockup
from v1 still happens? I wasn't able to reproduce it..
Thanks,
Dima
Changes since v2:
- Added reviewed-by tags
- Hopefully, fixed reported by 0-day issue.
- Added optional fix for wait_readers decrement
Changes since v1:
- Added tested-by/reported-by tags
- Dropped 3/4 (locking tty pair for lockdep sake),
Because of that - not adding lockdep_assert_held() in tty_ldisc_open()
- Added 4/4 cleanup to inc tty->count only on success of
tty_ldisc_reinit()
- lock ldisc without (5*HZ) timeout in tty_reopen()
v1 link:
lkml.kernel.org/r/<20180829022353.23568-1-dima(a)arista.com>
Huuge cc list:
Cc: Daniel Axtens <dja(a)axtens.net>
Cc: Dmitry Vyukov <dvyukov(a)google.com>
Cc: Michael Neuling <mikey(a)neuling.org>
Cc: Mikulas Patocka <mpatocka(a)redhat.com>
Cc: Nathan March <nathan(a)gt.net>
Cc: Pasi Kärkkäinen <pasik(a)iki.fi>
Cc: Peter Hurley <peter(a)hurleysoftware.com>
Cc: "Rong, Chen" <rong.a.chen(a)intel.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work(a)gmail.com>
Cc: Tan Xiaojun <tanxiaojun(a)huawei.com>
Cc: Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp>
(please, ignore if I Cc'ed you mistakenly)
Dmitry Safonov (6):
tty: Drop tty->count on tty_reopen() failure
tty/ldsem: Update waiter->task before waking up reader
tty: Hold tty_ldisc_lock() during tty_reopen()
tty/lockdep: Add ldisc_sem asserts
tty: Simplify tty->count math in tty_reopen()
tty/ldsem: Decrement wait_readers on timeouted down_read()
drivers/tty/tty_io.c | 12 ++++++++----
drivers/tty/tty_ldisc.c | 5 +++++
drivers/tty/tty_ldsem.c | 5 ++++-
3 files changed, 17 insertions(+), 5 deletions(-)
--
2.13.6
Hi,
If you have photos for editing, please send email to: hansrekan(a)outlook.com
We have 12 in house image editors and we can help you for cutting out your
photos, or path the photos.
Includes retouching if needed.
Used for products photos or portrait photos, catalog photos.
You may drop us one photo, we can send you the testing work.
Thanks,
Aaron Williams
Email: hansrekan(a)outlook.com
Hi,
If you have photos for editing, please send email to: hansrekan(a)outlook.com
We have 12 in house image editors and we can help you for cutting out your
photos, or path the photos.
Includes retouching if needed.
Used for products photos or portrait photos, catalog photos.
You may drop us one photo, we can send you the testing work.
Thanks,
Aaron Williams
Email: hansrekan(a)outlook.com
Hi,
If you have photos for editing, please send email to: hansrekan(a)outlook.com
We have 12 in house image editors and we can help you for cutting out your
photos, or path the photos.
Includes retouching if needed.
Used for products photos or portrait photos, catalog photos.
You may drop us one photo, we can send you the testing work.
Thanks,
Aaron Williams
Email: hansrekan(a)outlook.com