Re: [PATCH] pwm: core: Zero-initialize the temp state

Hello,

On Sat, Feb 25, 2023 at 05:37:21PM -0800, Munehisa Kamata wrote:

Zero-initialize the on-stack structure to avoid unexpected behaviors. Some drivers may not set or initialize all the values in pwm_state through their .get_state() callback and therefore some random values may remain there and be set into pwm->state eventually.

This actually caused regression on ODROID-N2+ as reported in [1]; kernel fails to boot due to random panic or hang-up.

[1] https://forum.odroid.com/viewtopic.php?f=177&t=46360

Looking through the report I wonder what actually made the machine fail to boot. Doesn't this paper over a problem that should be fixed (also) somewhere else?

Which driver is the one that the problem occur for?

Best regards Uwe