[PATCH] clk: rockchip: Fix static checker warning in rockchip_ddrclk_get_parent call

[PATCH] clk: rockchip: Fix static checker warning in rockchip_ddrclk_get_parent call

[Enric Balletbo i Serra]

Fixes the signedness bug returning '(-22)' on the return type by removing the
sanity checker in rockchip_ddrclk_get_parent(). The function should return
and unsigned value only and it's safe to remove the sanity checker as the
core functions that call get_parent like clk_core_get_parent_by_index already
ensures the validity of the clk index returned (index >= core->num_parents).

Fixes: a4f182bf81f18 ("clk: rockchip: add new clock-type for the ddrclk")
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---

 drivers/clk/rockchip/clk-ddr.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/clk/rockchip/clk-ddr.c b/drivers/clk/rockchip/clk-ddr.c
index de00590af167..fd5c90371dbf 100644
--- a/drivers/clk/rockchip/clk-ddr.c
+++ b/drivers/clk/rockchip/clk-ddr.c
@@ -185,16 +185,12 @@ rockchip_ddrclk_sip_recalc_rate(struct clk_hw *hw,
 static u8 rockchip_ddrclk_get_parent(struct clk_hw *hw)
 {
 	struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw);
-	int num_parents = clk_hw_get_num_parents(hw);
 	u32 val;
 
 	val = clk_readl(ddrclk->reg_base +
 			ddrclk->mux_offset) >> ddrclk->mux_shift;
 	val &= GENMASK(ddrclk->mux_width - 1, 0);
 
-	if (val >= num_parents)
-		return -EINVAL;
-
 	return val;
 }
 
-- 
2.19.1

Re: [PATCH] clk: rockchip: Fix static checker warning in rockchip_ddrclk_get_parent call

[Stephen Boyd]

Quoting Enric Balletbo i Serra (2018-10-16 06:41:44)
> Fixes the signedness bug returning '(-22)' on the return type by removing the
> sanity checker in rockchip_ddrclk_get_parent(). The function should return
> and unsigned value only and it's safe to remove the sanity checker as the
> core functions that call get_parent like clk_core_get_parent_by_index already
> ensures the validity of the clk index returned (index >= core->num_parents).
> 
> Fixes: a4f182bf81f18 ("clk: rockchip: add new clock-type for the ddrclk")
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

Re: [PATCH] clk: rockchip: Fix static checker warning in rockchip_ddrclk_get_parent call

[Heiko Stuebner]

Am Dienstag, 16. Oktober 2018, 15:41:44 CEST schrieb Enric Balletbo i Serra:
> Fixes the signedness bug returning '(-22)' on the return type by removing the
> sanity checker in rockchip_ddrclk_get_parent(). The function should return
> and unsigned value only and it's safe to remove the sanity checker as the
> core functions that call get_parent like clk_core_get_parent_by_index already
> ensures the validity of the clk index returned (index >= core->num_parents).
> 
> Fixes: a4f182bf81f18 ("clk: rockchip: add new clock-type for the ddrclk")
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

applied to my clk-branch with Stephen's Review


Thanks
Heiko