linux-kernel - [PATCH 4.18 030/235] clk: mvebu: armada-37xx-periph: Fix wrong return value in get

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Date:   Mon, 24 Sep 2018 13:50:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 030/235] clk: mvebu: armada-37xx-periph: Fix wrong return value in get_parent

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gregory CLEMENT <gregory.clement@...tlin.com>

[ Upstream commit 616bf80d381da13fbb392ebff06f46f946e3ee84 ]

The return value of the get_parent operation is a u8, whereas a -EINVAL
was returned. This wrong value was return if the value was bigger that
the number of parent but this case was already handled by the core.

So we can just remove this chunk of code to fix the issue.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Fixes: 9818a7a4fd10 ("clk: mvebu: armada-37xx-periph: prepare cpu clk to
be used with DVFS")
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/clk/mvebu/armada-37xx-periph.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/clk/mvebu/armada-37xx-periph.c
+++ b/drivers/clk/mvebu/armada-37xx-periph.c
@@ -429,9 +429,6 @@ static u8 clk_pm_cpu_get_parent(struct c
 		val &= pm_cpu->mask_mux;
 	}
 
-	if (val >= num_parents)
-		return -EINVAL;
-
 	return val;
 }