29 Oct
2015
29 Oct
'15
12:57 a.m.
Hi Geert
If the "clock-frequency" DT property is not found, req_rate is used uninitialized, and the "audio_clkout" clock will be created with an arbitrary clock rate.
This uninitialized kernel stack data may leak to userspace through /sys/kernel/debug/clk/clk_summary, cfr. the value in the "rate" column:
clock enable_cnt prepare_cnt rate accuracy phase -------------------------------------------------------------------- audio_clkout 0 0 4001836240 0 0Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be
Acked-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
Should the absence of this property be considered an error?
Documentation/devicetree/bindings/sound/renesas,rsnd.txt states that both "#clock-cells" and "clock-frequency" are required properties, but none of the R-Car Gen1 and Gen2 DTSes seem to have them?
This clkout is option for each board will fix