linux-kernel - [RFC PATCH] UBI: fix rb_tree node comparison in add

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Date:	Fri, 21 Mar 2014 15:54:03 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Richard Weinberger <richard@....at>
Cc:	linux-kernel@...r.kernel.org,
	Artem Bityutskiy <dedekind1@...il.com>,
	linux-mtd@...ts.infradead.org
Subject: [RFC PATCH] UBI: fix rb_tree node comparison in add_map

The comparisons used in add_vol() shouldn't be identical.  Pretty sure
the following is correct but it is completely untested.

Signed-off-by: Mike Snitzer <snitzer@...hat.com>
---
 drivers/mtd/ubi/fastmap.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

NOTE: I stumbled upon this code while implementing some rb_tree code
      (and looking for some existing rb_tree code as a reference).

diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index ead8613..60c7a20 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -125,9 +125,9 @@ static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
 		parent = *p;
 		av = rb_entry(parent, struct ubi_ainf_volume, rb);
 
-		if (vol_id > av->vol_id)
+		if (vol_id < av->vol_id)
 			p = &(*p)->rb_left;
-		else if (vol_id > av->vol_id)
+		else
 			p = &(*p)->rb_right;
 	}
 
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