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Linus Torvalds 8f443e2372 Revert "ocfs2: incorrect check for debugfs returns" 
This reverts commit e2ac55b6a8.

Huang Ying reports that this causes a hang at boot with debugfs disabled.

It is true that the debugfs error checks are kind of confusing, and this
code certainly merits more cleanup and thinking about it, but there's
something wrong with the trivial "check not just for NULL, but for error
pointers too" patch.

Yes, with debugfs disabled, we will end up setting the o2hb_debug_dir
pointer variable to an error pointer (-ENODEV), and then continue as if
everything was fine.  But since debugfs is disabled, all the _users_ of
that pointer end up being compiled away, so even though the pointer can
not be dereferenced, that's still fine.

So it's confusing and somewhat questionable, but the "more correct"
error checks end up causing more trouble than they fix.

Reported-by: Huang Ying <ying.huang@intel.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Chengyu Song <csong84@gatech.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2015-04-21 09:17:28 -07:00
..
9p 9p: patches for 4.1 merge window 2015-04-18 17:45:30 -04:00
adfs adfs: return correct return values 2015-04-17 09:04:08 -04:00
affs Merge branch 'akpm' (patches from Andrew) 2015-04-17 09:04:38 -04:00
afs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
autofs4 autofs: switch to __vfs_write() 2015-04-11 22:29:37 -04:00
befs befs: replace typedef befs_inode_info by structure 2015-04-17 09:04:03 -04:00
bfs bfs: correct return values 2015-04-17 09:04:09 -04:00
btrfs mirror O_APPEND and O_DIRECT into iocb->ki_flags 2015-04-11 22:30:22 -04:00
cachefiles Cachefiles: Fix up scripted S_ISDIR/S_ISREG/S_ISLNK conversions 2015-02-22 11:38:41 -05:00
ceph mirror O_APPEND and O_DIRECT into iocb->ki_flags 2015-04-11 22:30:22 -04:00
cifs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
coda make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
configfs configfs: Fix inconsistent use of file_inode() vs file->f_path.dentry->d_inode 2015-04-15 15:05:31 -04:00
cramfs
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debugfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
devpts
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dlm netlink: make nlmsg_end() and genlmsg_end() void 2015-01-18 01:03:45 -05:00
ecryptfs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
efivarfs * Move efivarfs from the misc filesystem section to pseudo filesystem, 2015-01-29 19:16:40 +01:00
efs
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exofs direct_IO: remove rw from a_ops->direct_IO() 2015-04-11 22:29:45 -04:00
exportfs VFS: (Scripted) Convert S_ISLNK/DIR/REG(dentry->d_inode) to d_is_*(dentry) 2015-02-22 11:38:41 -05:00
ext2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
ext3 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
ext4 A few bug fixes and add support for file-system level encryption in ext4. 2015-04-19 14:26:31 -07:00
f2fs Merge tag 'for-f2fs-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs 2015-04-18 11:17:20 -04:00
fat Merge branch 'akpm' (patches from Andrew) 2015-04-17 09:04:38 -04:00
freevxfs
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fscache fs/fscache/object-list.c: use __seq_open_private() 2014-10-13 17:52:21 +01:00
fuse mirror O_APPEND and O_DIRECT into iocb->ki_flags 2015-04-11 22:30:22 -04:00
gfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
hfs Merge branch 'akpm' (patches from Andrew) 2015-04-17 09:04:38 -04:00
hfsplus Merge branch 'akpm' (patches from Andrew) 2015-04-17 09:04:38 -04:00
hostfs Merge tag 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2015-04-15 13:49:27 -07:00
hpfs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
hppfs VFS: (Scripted) Convert S_ISLNK/DIR/REG(dentry->d_inode) to d_is_*(dentry) 2015-02-22 11:38:41 -05:00
hugetlbfs Merge branch 'akpm' (patches from Andrew) 2015-04-15 16:39:15 -07:00
isofs isofs: Fix bug in the way to check if the year is a leap year 2015-01-07 09:51:49 +01:00
jbd jbd: Deletion of an unnecessary check before the function call "iput" 2014-11-18 10:15:29 +01:00
jbd2 jbd2: complain about descriptor block checksum errors 2015-01-19 15:59:58 -05:00
jffs2 Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-15 13:22:56 -07:00
jfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
kernfs kernfs: handle poll correctly on 'direct_read' files. 2015-03-16 21:51:20 +01:00
lockd Merge branch 'for-3.20' of git://linux-nfs.org/~bfields/linux 2015-02-12 10:39:41 -08:00
logfs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
minix make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
ncpfs switch generic_write_checks() to iocb and iter 2015-04-11 22:30:21 -04:00
nfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
nfs_common
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nfsd Merge branch 'akpm' (patches from Andrew) 2015-04-15 16:39:15 -07:00
nilfs2 Merge branch 'akpm' (patches from Andrew) 2015-04-17 09:04:38 -04:00
nls
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notify fanotify: fix event filtering with FAN_ONDIR set 2015-03-12 18:46:08 -07:00
ntfs switch generic_write_checks() to iocb and iter 2015-04-11 22:30:21 -04:00
ocfs2 Revert "ocfs2: incorrect check for debugfs returns" 2015-04-21 09:17:28 -07:00
omfs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
openpromfs
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overlayfs ovl: upper fs should not be R/O 2015-03-18 10:29:48 +01:00
proc proc: show locks in /proc/pid/fdinfo/X 2015-04-17 09:04:12 -04:00
pstore powerpc updates for 4.1 2015-04-16 13:53:32 -05:00
qnx4
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qnx6
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quota vfs: Add general support to enforce project quota limits 2015-03-18 21:55:08 +01:00
ramfs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
reiserfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
romfs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
squashfs Squashfs: Add LZ4 compression configuration option 2014-11-27 18:48:44 +00:00
sysfs sysfs: Only accept read/write permissions for file attributes 2015-03-25 13:27:57 +01:00
sysv make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
tracefs tracing: Have mkdir and rmdir be part of tracefs 2015-02-03 12:48:43 -05:00
ubifs This pull request includes the following UBI/UBIFS changes: 2015-04-15 13:43:40 -07:00
udf Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
ufs make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
xfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
Kconfig f2fs: relocate Kconfig from misc filesystems 2015-04-10 15:08:35 -07:00
Kconfig.binfmt mm: split ET_DYN ASLR from mmap ASLR 2015-04-14 16:49:05 -07:00
Makefile This adds the new tracefs file system. This has been in linux-next for 2015-04-14 10:22:29 -07:00
aio.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
anon_inodes.c
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attr.c
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bad_inode.c don't bother with most of the bad_file_ops methods 2015-02-20 04:03:58 -05:00
binfmt_aout.c assorted conversions to %p[dD] 2014-11-19 13:01:20 -05:00
binfmt_elf.c mm: fold arch_randomize_brk into ARCH_HAS_ELF_RANDOMIZE 2015-04-14 16:49:05 -07:00
binfmt_elf_fdpic.c handle suicide on late failure exits in execve() in search_binary_handler() 2014-10-09 02:39:00 -04:00
binfmt_em86.c syscalls: implement execveat() system call 2014-12-13 12:42:51 -08:00
binfmt_flat.c
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binfmt_misc.c fs/binfmt_misc.c: simplify entry_status() 2015-04-17 09:03:59 -04:00
binfmt_script.c syscalls: implement execveat() system call 2014-12-13 12:42:51 -08:00
block_dev.c blkdev_write_iter: expand generic_file_checks() call in there 2015-04-11 22:29:48 -04:00
buffer.c page_writeback: clean up mess around cancel_dirty_page() 2015-04-14 16:49:01 -07:00
char_dev.c fs: introduce f_op->mmap_capabilities for nommu mmap support 2015-01-20 14:02:58 -07:00
compat.c vfs: make first argument of dir_context.actor typed 2014-10-31 17:48:54 -04:00
compat_binfmt_elf.c
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compat_ioctl.c Bluetooth: bnep: Add support for get bnep features via ioctl 2015-04-03 23:21:34 +02:00
coredump.c coredump: accept any write method 2015-04-11 22:29:39 -04:00
dax.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-16 23:27:56 -04:00
dcache.c VFS: Impose ordering on accesses of d_inode and d_flags 2015-04-15 15:05:28 -04:00
dcookies.c
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direct-io.c Remove rw from {,__,do_}blockdev_direct_IO() 2015-04-11 22:29:44 -04:00
drop_caches.c vmscan: per memory cgroup slab shrinkers 2015-02-12 18:54:09 -08:00
eventfd.c eventfd: don't take the spinlock in eventfd_poll 2015-02-17 14:34:52 -08:00
eventpoll.c epoll: optimize setting task running after blocking 2015-02-13 21:21:40 -08:00
exec.c fs: take i_mutex during prepare_binprm for set[ug]id executables 2015-04-19 13:46:21 -07:00
fcntl.c vfs: renumber FMODE_NONOTIFY and add to uniqueness check 2015-01-08 15:10:52 -08:00
fhandle.c
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file.c mm: rcu-protected get_mm_exe_file() 2015-04-17 09:04:07 -04:00
file_table.c ->aio_read and ->aio_write removed 2015-04-11 22:29:43 -04:00
filesystems.c
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fs-writeback.c fs: add dirtytime_expire_seconds sysctl 2015-03-17 12:23:32 -04:00
fs_pin.c fs_pin: Allow for the possibility that m_list or s_list go unused. 2015-04-09 11:39:55 -05:00
fs_struct.c
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inode.c Merge branch 'lazytime' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-02-17 16:12:34 -08:00
internal.h trylock_super(): replacement for grab_super_passive() 2015-02-22 11:38:42 -05:00
ioctl.c fsioctl.c: make generic_block_fiemap() signal-tolerant 2015-02-10 14:30:30 -08:00
libfs.c VFS: (Scripted) Convert S_ISLNK/DIR/REG(dentry->d_inode) to d_is_*(dentry) 2015-02-22 11:38:41 -05:00
locks.c proc: show locks in /proc/pid/fdinfo/X 2015-04-17 09:04:12 -04:00
mbcache.c
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mount.h switch the IO-triggering parts of umount to fs_pin 2015-01-25 23:17:29 -05:00
mpage.c vfs: guard end of device for mpage interface 2014-10-09 22:25:53 -04:00
namei.c VFS: Make pathwalk use d_is_reg() rather than S_ISREG() 2015-04-15 15:05:30 -04:00
namespace.c mnt: Update detach_mounts to leave mounts connected 2015-04-09 11:39:57 -05:00
no-block.c
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nsfs.c take the targets of /proc/*/ns/* symlinks to separate fs 2014-12-10 21:30:20 -05:00
open.c ->aio_read and ->aio_write removed 2015-04-11 22:29:43 -04:00
pipe.c make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
pnode.c mnt: Don't propagate unmounts to locked mounts 2015-04-02 20:34:20 -05:00
pnode.h mnt: Honor MNT_LOCKED when detaching mounts 2015-04-09 11:39:55 -05:00
posix_acl.c VFS: (Scripted) Convert S_ISLNK/DIR/REG(dentry->d_inode) to d_is_*(dentry) 2015-02-22 11:38:41 -05:00
proc_namespace.c vfs: add support for a lazytime mount option 2015-02-05 02:45:00 -05:00
read_write.c new_sync_write(): discard ->ki_pos unless the return value is positive 2015-04-11 22:29:46 -04:00
readdir.c vfs: make first argument of dir_context.actor typed 2014-10-31 17:48:54 -04:00
select.c all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
seq_file.c bitmap, cpumask, nodemask: remove dedicated formatting functions 2015-02-13 21:21:39 -08:00
signalfd.c fs: Convert show_fdinfo functions to void 2014-11-05 14:13:23 -05:00
splice.c dax: unify ext2/4_{dax,}_file_operations 2015-04-15 16:35:20 -07:00
stack.c
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stat.c switch security_inode_getattr() to struct path * 2015-04-11 22:24:32 -04:00
statfs.c
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super.c cleancache: remove limit on the number of cleancache enabled filesystems 2015-04-14 16:49:03 -07:00
sync.c vfs: add support for a lazytime mount option 2015-02-05 02:45:00 -05:00
timerfd.c fs: Convert show_fdinfo functions to void 2014-11-05 14:13:23 -05:00
utimes.c
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xattr.c new helper: audit_file() 2014-11-19 13:01:26 -05:00