Messages in this thread | | | From | "Tian, Kevin" <> | Subject | RE: [PATCH v3 4/5] iommufd: Add replace support in iommufd_access_set_ioas() | Date | Thu, 2 Mar 2023 08:23:54 +0000 |
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> From: Nicolin Chen <nicolinc@nvidia.com> > Sent: Saturday, February 25, 2023 9:52 AM > > + /* > + * Set ioas to NULL to block any further iommufd_access_pin_pages(). > + * iommufd_access_unpin_pages() can continue using access- > >ioas_unpin. > + */ > + access->ioas = NULL; > + > + mutex_unlock(&access->ioas_lock); > + access->ops->unmap(access->data, 0, ULONG_MAX); > + mutex_lock(&access->ioas_lock);
This should check whether @unmap is valid.
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