linux-kernel - [PATCH] of: fdt: remove unnecessary codes

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Message-ID: <20210701140457epcms1p2cc43a7c62150f012619feab913f017af@epcms1p2>
Date:   Thu, 01 Jul 2021 23:04:57 +0900
From:   권오훈 <ohoono.kwon@...sung.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "frowand.list@...il.com" <frowand.list@...il.com>
CC:     "lee.jones@...aro.org" <lee.jones@...aro.org>,
        권오훈 <ohoono.kwon@...sung.com>,
        "ohkwon1043@...il.com" <ohkwon1043@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] of: fdt: remove unnecessary codes

While unflattening the device tree, we try to populate dt nodes and
properties into tree-shaped data structure.

In populate_properties function, pprev is initially set to
&np->properties, and then updated to &pp->next.

In both scenarios *pprev is NULL, since the memory area that we are
allocating from is initially zeroed.

I tested the code as below, and it showed that BUG was never called.

-       if (!dryrun)
+       if (!dryrun) {
+               if (*pprev)
+                       BUG();
                *pprev = NULL;
+       }

Let's remove unnecessary code.

Signed-off-by: Ohhoon Kwon <ohoono.kwon@...sung.com>
---
 drivers/of/fdt.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index ba17a80b8c79..5e71f5eb35b1 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -200,9 +200,6 @@ static void populate_properties(const void *blob,
 				 nodename, (char *)pp->value);
 		}
 	}
-
-	if (!dryrun)
-		*pprev = NULL;
 }
 
 static int populate_node(const void *blob,
-- 
2.17.1