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Subject[PATCH AUTOSEL 5.4 171/459] clk: imx: Add correct failure handling for clk based helpers
Date
From: Abel Vesa <abel.vesa@nxp.com>

[ Upstream commit f60f1c62c3188fcca945581e35e3440ee3fdcc95 ]

If the clk_hw based API returns an error, trying to return the clk from
hw will end up in a NULL pointer dereference. So adding the to_clk
checker and using it inside every clk based macro helper we handle that
case correctly.

This to_clk is also temporary and will go away along with the clk based
macro helpers once there is no user that need them anymore.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clk/imx/clk.h | 37 ++++++++++++++++++++++---------------
1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
index f7a389a50401a..6fe64ff8ffa12 100644
--- a/drivers/clk/imx/clk.h
+++ b/drivers/clk/imx/clk.h
@@ -51,48 +51,48 @@ struct imx_pll14xx_clk {
};

#define imx_clk_cpu(name, parent_name, div, mux, pll, step) \
- imx_clk_hw_cpu(name, parent_name, div, mux, pll, step)->clk
+ to_clk(imx_clk_hw_cpu(name, parent_name, div, mux, pll, step))

#define clk_register_gate2(dev, name, parent_name, flags, reg, bit_idx, \
cgr_val, clk_gate_flags, lock, share_count) \
- clk_hw_register_gate2(dev, name, parent_name, flags, reg, bit_idx, \
- cgr_val, clk_gate_flags, lock, share_count)->clk
+ to_clk(clk_hw_register_gate2(dev, name, parent_name, flags, reg, bit_idx, \
+ cgr_val, clk_gate_flags, lock, share_count))

#define imx_clk_pllv3(type, name, parent_name, base, div_mask) \
- imx_clk_hw_pllv3(type, name, parent_name, base, div_mask)->clk
+ to_clk(imx_clk_hw_pllv3(type, name, parent_name, base, div_mask))

#define imx_clk_pfd(name, parent_name, reg, idx) \
- imx_clk_hw_pfd(name, parent_name, reg, idx)->clk
+ to_clk(imx_clk_hw_pfd(name, parent_name, reg, idx))

#define imx_clk_gate_exclusive(name, parent, reg, shift, exclusive_mask) \
- imx_clk_hw_gate_exclusive(name, parent, reg, shift, exclusive_mask)->clk
+ to_clk(imx_clk_hw_gate_exclusive(name, parent, reg, shift, exclusive_mask))

#define imx_clk_fixed_factor(name, parent, mult, div) \
- imx_clk_hw_fixed_factor(name, parent, mult, div)->clk
+ to_clk(imx_clk_hw_fixed_factor(name, parent, mult, div))

#define imx_clk_divider2(name, parent, reg, shift, width) \
- imx_clk_hw_divider2(name, parent, reg, shift, width)->clk
+ to_clk(imx_clk_hw_divider2(name, parent, reg, shift, width))

#define imx_clk_gate_dis(name, parent, reg, shift) \
- imx_clk_hw_gate_dis(name, parent, reg, shift)->clk
+ to_clk(imx_clk_hw_gate_dis(name, parent, reg, shift))

#define imx_clk_gate2(name, parent, reg, shift) \
- imx_clk_hw_gate2(name, parent, reg, shift)->clk
+ to_clk(imx_clk_hw_gate2(name, parent, reg, shift))

#define imx_clk_gate2_flags(name, parent, reg, shift, flags) \
- imx_clk_hw_gate2_flags(name, parent, reg, shift, flags)->clk
+ to_clk(imx_clk_hw_gate2_flags(name, parent, reg, shift, flags))

#define imx_clk_gate2_shared2(name, parent, reg, shift, share_count) \
- imx_clk_hw_gate2_shared2(name, parent, reg, shift, share_count)->clk
+ to_clk(imx_clk_hw_gate2_shared2(name, parent, reg, shift, share_count))

#define imx_clk_gate3(name, parent, reg, shift) \
- imx_clk_hw_gate3(name, parent, reg, shift)->clk
+ to_clk(imx_clk_hw_gate3(name, parent, reg, shift))

#define imx_clk_gate4(name, parent, reg, shift) \
- imx_clk_hw_gate4(name, parent, reg, shift)->clk
+ to_clk(imx_clk_hw_gate4(name, parent, reg, shift))

#define imx_clk_mux(name, reg, shift, width, parents, num_parents) \
- imx_clk_hw_mux(name, reg, shift, width, parents, num_parents)->clk
+ to_clk(imx_clk_hw_mux(name, reg, shift, width, parents, num_parents))

struct clk *imx_clk_pll14xx(const char *name, const char *parent_name,
void __iomem *base, const struct imx_pll14xx_clk *pll_clk);
@@ -195,6 +195,13 @@ struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg,
u8 shift, u8 width, const char * const *parents,
int num_parents, void (*fixup)(u32 *val));

+static inline struct clk *to_clk(struct clk_hw *hw)
+{
+ if (IS_ERR_OR_NULL(hw))
+ return ERR_CAST(hw);
+ return hw->clk;
+}
+
static inline struct clk *imx_clk_fixed(const char *name, int rate)
{
return clk_register_fixed_rate(NULL, name, NULL, 0, rate);
--
2.20.1
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