Miklos Szeredi 18cd6106cf fuse: fix possibly missed wake-up after abort ... commit 2d84a2d19b upstream. In current fuse_drop_waiting() implementation it's possible that fuse_wait_aborted() will not be woken up in the unlikely case that fuse_abort_conn() + fuse_wait_aborted() runs in between checking fc->connected and calling atomic_dec(&fc->num_waiting). Do the atomic_dec_and_test() unconditionally, which also provides the necessary barrier against reordering with the fc->connected check. The explicit smp_mb() in fuse_wait_aborted() is not actually needed, since the spin_unlock() in fuse_abort_conn() provides the necessary RELEASE barrier after resetting fc->connected. However, this is not a performance sensitive path, and adding the explicit barrier makes it easier to document. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Fixes: b8f95e5d13 ("fuse: umount should wait for all requests") Cc: <stable@vger.kernel.org> #v4.19 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-11-21 09:19:24 +01:00
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acl.c	fuse: Support fuse filesystems outside of init_user_ns	2018-03-20 17:11:44 +01:00
control.c	fuse: fix control dir setup and teardown	2018-05-31 12:26:10 +02:00
cuse.c	fuse: Support fuse filesystems outside of init_user_ns	2018-03-20 17:11:44 +01:00
dev.c	fuse: fix possibly missed wake-up after abort	2018-11-21 09:19:24 +01:00
dir.c	fuse update for 4.19	2018-08-21 18:47:36 -07:00
file.c	fuse: fix use-after-free in fuse_direct_IO()	2018-11-21 09:19:23 +01:00
fuse_i.h	fuse: fix initial parallel dirops	2018-07-26 16:13:11 +02:00
inode.c	fuse: convert last timespec use to timespec64	2018-07-26 16:13:12 +02:00
Kconfig	fuse: Add posix ACL support	2016-10-01 07:32:32 +02:00
Makefile	fuse: Use generic xattr ops	2016-10-01 07:32:32 +02:00
xattr.c	fuse: Ensure posix acls are translated outside of init_user_ns	2018-05-31 12:26:10 +02:00