linux-kernel - [PATCH 086/124] staging: lustre: obdclass: eliminate NULL error return

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Date:   Sun, 18 Sep 2016 16:38:25 -0400
From:   James Simmons <jsimmons@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>,
        Bob Glossman <bob.glossman@...el.com>,
        James Simmons <jsimmons@...radead.org>
Subject: [PATCH 086/124] staging: lustre: obdclass: eliminate NULL error return

From: Bob Glossman <bob.glossman@...el.com>

Always return an ERR_PTR() on errors, never return a NULL,
in lu_object_find_slice().  Also clean up callers who
no longer need special case handling of NULL returns.

Signed-off-by: Bob Glossman <bob.glossman@...el.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5858
Reviewed-on: http://review.whamcloud.com/12554
Reviewed-by: Dmitry Eremin <dmitry.eremin@...el.com>
Reviewed-by: Fan Yong <fan.yong@...el.com>
Reviewed-by: John L. Hammond <john.hammond@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
Signed-off-by: James Simmons <jsimmons@...radead.org>
---
 drivers/staging/lustre/lustre/obdclass/lu_object.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c
index 7339c8b..3f1fb28 100644
--- a/drivers/staging/lustre/lustre/obdclass/lu_object.c
+++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c
@@ -767,13 +767,15 @@ struct lu_object *lu_object_find_slice(const struct lu_env *env,
 	struct lu_object *obj;
 
 	top = lu_object_find(env, dev, f, conf);
-	if (!IS_ERR(top)) {
-		obj = lu_object_locate(top->lo_header, dev->ld_type);
-		if (!obj)
-			lu_object_put(env, top);
-	} else {
-		obj = top;
+	if (IS_ERR(top))
+		return top;
+
+	obj = lu_object_locate(top->lo_header, dev->ld_type);
+	if (unlikely(!obj)) {
+		lu_object_put(env, top);
+		obj = ERR_PTR(-ENOENT);
 	}
+
 	return obj;
 }
 EXPORT_SYMBOL(lu_object_find_slice);
-- 
1.7.1