Displaying 2 results from an estimated 2 matches for "read_down".
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2019 Jul 03
1
[PATCH 4/5] nouveau: unlock mmap_sem on all errors from nouveau_range_fault
...a->vm_mm->mmap_sem);
> - ret = -EBUSY;
> - } else if (ret == -EAGAIN)
> + if (ret == 0)
> ret = -EBUSY;
> + if (ret != -EAGAIN)
> + up_read(&range->vma->vm_mm->mmap_sem);
Can ret == -EAGAIN happen if "block = true"?
Generally, I prefer the read_down()/read_up() in the same function
(i.e., nouveau_svm_fault()) but I can see why it should be here
if hmm_range_fault() can return with mmap_sem unlocked.
> hmm_range_unregister(range);
> return ret;
> }
> +
> return 0;
> }
>
> @@ -718,8 +719,8 @@ nouveau_s...
2019 Jul 03
8
hmm_range_fault related fixes and legacy API removal
Hi Jérôme, Ben and Jason,
below is a series against the hmm tree which fixes up the mmap_sem
locking in nouveau and while at it also removes leftover legacy HMM APIs
only used by nouveau.