Revert "ocfs2: incorrect check for debugfs returns"

This reverts commit e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6.

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>

3 files changed, 16 insertions, 37 deletions

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 8e19b9d7aba8..16eff45727ee 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1312,9 +1312,7 @@ static int o2hb_debug_init(void)
         int ret = -ENOMEM;
 
         o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
-        if (IS_ERR_OR_NULL(o2hb_debug_dir)) {
-                ret = o2hb_debug_dir ?
-                        PTR_ERR(o2hb_debug_dir) : -ENOMEM;
+        if (!o2hb_debug_dir) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -1327,9 +1325,7 @@ static int o2hb_debug_init(void)
                                                  sizeof(o2hb_live_node_bitmap),
                                                  O2NM_MAX_NODES,
                                                  o2hb_live_node_bitmap);
-        if (IS_ERR_OR_NULL(o2hb_debug_livenodes)) {
-                ret = o2hb_debug_livenodes ?
-                        PTR_ERR(o2hb_debug_livenodes) : -ENOMEM;
+        if (!o2hb_debug_livenodes) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -1342,9 +1338,7 @@ static int o2hb_debug_init(void)
                                                    sizeof(o2hb_live_region_bitmap),
                                                    O2NM_MAX_REGIONS,
                                                    o2hb_live_region_bitmap);
-        if (IS_ERR_OR_NULL(o2hb_debug_liveregions)) {
-                ret = o2hb_debug_liveregions ?
-                        PTR_ERR(o2hb_debug_liveregions) : -ENOMEM;
+        if (!o2hb_debug_liveregions) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -1358,9 +1352,7 @@ static int o2hb_debug_init(void)
                                           sizeof(o2hb_quorum_region_bitmap),
                                           O2NM_MAX_REGIONS,
                                           o2hb_quorum_region_bitmap);
-        if (IS_ERR_OR_NULL(o2hb_debug_quorumregions)) {
-                ret = o2hb_debug_quorumregions ?
-                        PTR_ERR(o2hb_debug_quorumregions) : -ENOMEM;
+        if (!o2hb_debug_quorumregions) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -1374,9 +1366,7 @@ static int o2hb_debug_init(void)
                                           sizeof(o2hb_failed_region_bitmap),
                                           O2NM_MAX_REGIONS,
                                           o2hb_failed_region_bitmap);
-        if (IS_ERR_OR_NULL(o2hb_debug_failedregions)) {
-                ret = o2hb_debug_failedregions ?
-                        PTR_ERR(o2hb_debug_failedregions) : -ENOMEM;
+        if (!o2hb_debug_failedregions) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -2010,8 +2000,7 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
 
         reg->hr_debug_dir =
                 debugfs_create_dir(config_item_name(&reg->hr_item), dir);
-        if (IS_ERR_OR_NULL(reg->hr_debug_dir)) {
-                ret = reg->hr_debug_dir ? PTR_ERR(reg->hr_debug_dir) : -ENOMEM;
+        if (!reg->hr_debug_dir) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -2024,9 +2013,7 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
                                           O2HB_DB_TYPE_REGION_LIVENODES,
                                           sizeof(reg->hr_live_node_bitmap),
                                           O2NM_MAX_NODES, reg);
-        if (IS_ERR_OR_NULL(reg->hr_debug_livenodes)) {
-                ret = reg->hr_debug_livenodes ?
-                        PTR_ERR(reg->hr_debug_livenodes) : -ENOMEM;
+        if (!reg->hr_debug_livenodes) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -2038,9 +2025,7 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
                                           sizeof(*(reg->hr_db_regnum)),
                                           O2HB_DB_TYPE_REGION_NUMBER,
                                           0, O2NM_MAX_NODES, reg);
-        if (IS_ERR_OR_NULL(reg->hr_debug_regnum)) {
-                ret = reg->hr_debug_regnum ?
-                        PTR_ERR(reg->hr_debug_regnum) : -ENOMEM;
+        if (!reg->hr_debug_regnum) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -2052,9 +2037,7 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
                                           sizeof(*(reg->hr_db_elapsed_time)),
                                           O2HB_DB_TYPE_REGION_ELAPSED_TIME,
                                           0, 0, reg);
-        if (IS_ERR_OR_NULL(reg->hr_debug_elapsed_time)) {
-                ret = reg->hr_debug_elapsed_time ?
-                        PTR_ERR(reg->hr_debug_elapsed_time) : -ENOMEM;
+        if (!reg->hr_debug_elapsed_time) {
                 mlog_errno(ret);
                 goto bail;
         }
@@ -2066,16 +2049,13 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
                                           sizeof(*(reg->hr_db_pinned)),
                                           O2HB_DB_TYPE_REGION_PINNED,
                                           0, 0, reg);
-        if (IS_ERR_OR_NULL(reg->hr_debug_pinned)) {
-                ret = reg->hr_debug_pinned ?
-                        PTR_ERR(reg->hr_debug_pinned) : -ENOMEM;
+        if (!reg->hr_debug_pinned) {
                 mlog_errno(ret);
                 goto bail;
         }
 
-        return 0;
+        ret = 0;
 bail:
-        debugfs_remove_recursive(reg->hr_debug_dir);
         return ret;
 }
 
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 956edf67be20..8b23aa2f52dd 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -2959,7 +2959,7 @@ static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
                                                          osb->osb_debug_root,
                                                          osb,
                                                          &ocfs2_dlm_debug_fops);
-        if (IS_ERR_OR_NULL(dlm_debug->d_locking_state)) {
+        if (!dlm_debug->d_locking_state) {
                 ret = -EINVAL;
                 mlog(ML_ERROR,
                      "Unable to create locking state debugfs file.\n");
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 837ddce4b659..403c5660b306 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1112,7 +1112,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 
         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
                                                  ocfs2_debugfs_root);
-        if (IS_ERR_OR_NULL(osb->osb_debug_root)) {
+        if (!osb->osb_debug_root) {
                 status = -EINVAL;
                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
                 goto read_super_error;
@@ -1122,7 +1122,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
                                             osb->osb_debug_root,
                                             osb,
                                             &ocfs2_osb_debug_fops);
-        if (IS_ERR_OR_NULL(osb->osb_ctxt)) {
+        if (!osb->osb_ctxt) {
                 status = -EINVAL;
                 mlog_errno(status);
                 goto read_super_error;
@@ -1606,9 +1606,8 @@ static int __init ocfs2_init(void)
         }
 
         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
-        if (IS_ERR_OR_NULL(ocfs2_debugfs_root)) {
-                status = ocfs2_debugfs_root ?
-                        PTR_ERR(ocfs2_debugfs_root) : -ENOMEM;
+        if (!ocfs2_debugfs_root) {
+                status = -ENOMEM;
                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
                 goto out4;
         }