Messages in this thread | | | Date | Tue, 23 Jul 2019 14:30:32 -0300 | From | Jason Gunthorpe <> | Subject | Re: [PATCH 4/6] nouveau: unlock mmap_sem on all errors from nouveau_range_fault |
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On Tue, Jul 23, 2019 at 07:23:35PM +0200, Christoph Hellwig wrote: > On Tue, Jul 23, 2019 at 02:17:31PM -0300, Jason Gunthorpe wrote: > > That reminds me, this code is also leaking hmm_range_unregister() in > > the success path, right? > > No, that is done by hmm_vma_range_done / nouveau_range_done for the > success path.
.. which is done with the mmap_sem held :(
> > I think the right way to structure this is to move the goto again and > > related into the nouveau_range_fault() so the whole retry algorithm is > > sensibly self contained. > > Then we'd take svmm->mutex inside the helper and let the caller > unlock that. Either way it is a bit of a mess, and I'd rather prefer > if someone has the hardware would do a grand rewrite of this path > eventually. Alternatively if no one signs up to mainain this code > we should eventually drop it given the staging status.
I tend to agree with the sentiment, it just makes me sad that all the examples we have of these APIs are so troubled.
Jason
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