[GIT PULL] fasync fix for v4.18

[Jeff Layton]

The following changes since commit fff75eb2a08c2ac96404a2d79685668f3cf5a7a3:

  Merge tag 'errseq-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux (2018-04-30 16:53:40 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git tags/locks-v4.18-1

for you to fetch changes up to 7a107c0f55a3b4c6f84a4323df5610360bde1684:

  fasync: Fix deadlock between task-context and interrupt-context kill_fasync() (2018-05-01 07:39:50 -0400)

----------------------------------------------------------------

Just a single fix for a deadlock in the fasync handling code that Kirill
observed while testing. The fix is to change the fa_lock to be rwlock_t,
and use a read lock in kill_fasync_rcu.

----------------------------------------------------------------
Kirill Tkhai (1):
      fasync: Fix deadlock between task-context and interrupt-context kill_fasync()

 fs/fcntl.c         | 15 +++++++--------
 include/linux/fs.h |  2 +-
 2 files changed, 8 insertions(+), 9 deletions(-)

-- 
Jeff Layton <jlayton@xxxxxxxxxx>