linux-kernel - [PATCH 4.20 10/88] clk: vc5: Abort clock configuration without upstream clock

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Date:   Mon,  4 Mar 2019 09:21:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Alexey Firago <alexey_firago@...tor.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-renesas-soc@...r.kernel.org, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.20 10/88] clk: vc5: Abort clock configuration without upstream clock

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

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

[ Upstream commit 2137a109a5e39c2bdccfffe65230ed3fadbaac0e ]

In case the upstream clock are not set, which can happen in case the
VC5 has no valid upstream clock, the $src variable is used uninited
by regmap_update_bits(). Check for this condition and return -EINVAL
in such case.

Note that in case the VC5 has no valid upstream clock, the VC5 can
not operate correctly. That is a hardware property of the VC5. The
internal oscilator present in some VC5 models is also considered
upstream clock.

Signed-off-by: Marek Vasut <marek.vasut+renesas@...il.com>
Cc: Alexey Firago <alexey_firago@...tor.com>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Stephen Boyd <sboyd@...nel.org>
Cc: linux-renesas-soc@...r.kernel.org
[sboyd@...nel.org: Added comment about probe preventing this from
happening in the first place]
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/clk-versaclock5.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c
index decffb3826ece..a738af893532f 100644
--- a/drivers/clk/clk-versaclock5.c
+++ b/drivers/clk/clk-versaclock5.c
@@ -262,8 +262,10 @@ static int vc5_mux_set_parent(struct clk_hw *hw, u8 index)
 
 		if (vc5->clk_mux_ins == VC5_MUX_IN_XIN)
 			src = VC5_PRIM_SRC_SHDN_EN_XTAL;
-		if (vc5->clk_mux_ins == VC5_MUX_IN_CLKIN)
+		else if (vc5->clk_mux_ins == VC5_MUX_IN_CLKIN)
 			src = VC5_PRIM_SRC_SHDN_EN_CLKIN;
+		else /* Invalid; should have been caught by vc5_probe() */
+			return -EINVAL;
 	}
 
 	return regmap_update_bits(vc5->regmap, VC5_PRIM_SRC_SHDN, mask, src);
-- 
2.19.1