Hello Vladimir Zapolskiy (and other clk devs as well),
The patch f7c82a60ba26: "clk: lpc32xx: add common clock framework
driver" from Dec 6, 2015, leads to the following static checker
warning:
drivers/clk/nxp/clk-lpc32xx.c:1019 clk_mux_get_parent()
warn: signedness bug returning '(-22)'
drivers/clk/nxp/clk-lpc32xx.c
1003 static u8 clk_mux_get_parent(struct clk_hw *hw)
^^
1004 {
1005 struct lpc32xx_clk_mux *mux = to_lpc32xx_mux(hw);
1006 u32 num_parents = clk_hw_get_num_parents(hw);
1007 u32 val;
1008
1009 regmap_read(clk_regmap, mux->reg, &val);
1010 val >>= mux->shift;
1011 val &= mux->mask;
1012
1013 if (mux->table) {
1014 u32 i;
1015
1016 for (i = 0; i < num_parents; i++)
1017 if (mux->table[i] == val)
1018 return i;
1019 return -EINVAL;
^^^^^^^^^^^^^^
1020 }
1021
1022 if (val >= num_parents)
1023 return -EINVAL;
^^^^^^^^^^^^^^
This obviously doesn't work since this is a u8 function.
I looked at how this was called to see what we should return on error.
This is called from __clk_init(). It tests for negative error codes.
Ooops. Also there is no static checker warning for that but I will
create one. I'm not sure what to do here. I bet the correct thing is
to convert all the get_parent() function to return int. Another option
might be to add documentation, but I feel like in the kernel int returns
are self documenting and that's the best option.
1024
1025 return val;
1026 }
regards,
dan carpenter
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