• Martin Blumenstingl's avatar
    pwm: meson: Fix allocation of PWM channel array · 735596ca
    Martin Blumenstingl authored
    Using the pwm-meson driver on the 32-bit SoCs causes memory corruption.
    The result are some hard-to-explain errors, for example
    devm_clk_register() crashes with a NULL dereference somewhere deep in
    the common clock framework code. In some cases the kernel even refused
    to boot when any of the PWM controllers were enabled on Meson8b.
    
    The root cause is an incorrect memory size in the devm_kcalloc() call in
    meson_pwm_probe(). The code allocates an array of meson_pwm_channel
    structs, but the size given is the size of the meson_pwm struct (which
    seems like a small copy-and-paste error, as meson_pwm is allocated a few
    lines above).
    
    Even with this typo the code seemed to work fine on the 64-bit GX SoCs
    (maybe due to the structs having the same size in the compiled result,
    but I haven't checked this further).
    
    Fixes: 211ed630 ("pwm: Add support for Meson PWM Controller")
    Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
    Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
    735596ca
pwm-meson.c 14.7 KB