Re: [GIT PULL] Pin control fixes for v6.7

[Linus Torvalds]

On Wed, 29 Nov 2023 at 04:09, Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
>
> The most interesting patch is the list iterator fix in the core by Maria
> Yu, it took a while for me to realize what was going on there.

That commit message still doesn't explain what the problem was.

Why is p->state volatile there? It seems to be a serious locking bug
if p->state can randomly change there, and the READ_ONCE() looks like
a "this hides the problem" rather than an actual real fix.

                   Linus