4.19-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@xxxxxxxxx> Cc: Alexey Firago <alexey_firago@xxxxxxxxxx> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Cc: Stephen Boyd <sboyd@xxxxxxxxxx> Cc: linux-renesas-soc@xxxxxxxxxxxxxxx [sboyd@xxxxxxxxxx: Added comment about probe preventing this from happening in the first place] Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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
