Messages in this thread | | | From | Qiujun Huang <> | Date | Wed, 18 Mar 2020 06:33:34 +0800 | Subject | Re: [PATCH RESEND] drm/lease: fix potential race in fill_object_idr |
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On Wed, Mar 18, 2020 at 1:02 AM Daniel Vetter <daniel@ffwll.ch> wrote: > > On Mon, Mar 16, 2020 at 03:18:23PM +0800, Qiujun Huang wrote: > > We should hold idr_mutex for idr_alloc. > > > > Signed-off-by: Qiujun Huang <hqjagain@gmail.com> > > I've not seen the first version of this anywhere in my inbox, not sure > where that got lost. > > Anyway, this seems like a false positive - I'm assuming this was caught > with KCSAN. The commit message really should mention that. > > fill_object_idr creates the idr, which yes is only access later on under > the idr_mutex. But here it's not yet visible to any other thread, and > hence lockless access is safe and correct.
Agree that. Thanks.
> > No idea what the KCSAN complains about safe access like this best practice > is. > -Daniel >
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