On Fri, Dec 01, 2023 at 03:51:51PM +0100, Jan Kundrát wrote: > The TL;DR summary is that the regmap_noinc_write spills over the data > that are correctly written to the HW also to the following registers in > the regcache. As a result, regcache then contains user-controlled > garbage which will be used later for bit updates on unrelated registers. > I was investigating a regression that happened somewhere between 5.12.4 > (plus 14 of our patches) and v6.5.9 (plus 7 of our patches). Our Can you reproduce this with current kernels? That's not even an up to date v6.5 - we're up to v6.5.13 now from the looks of things including one upstream fix that looks potentially relevant. The most direct thing would be to write a kunit test demonstrating the issue with current mainline. If things are already fine with mainline then you'd need to talk to the stable maintainers about what they've chosen to backport.
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