Re: [Xen-devel] [PATCH 16/34] drivers/tee: convert put_page() to put_user_page*()

[Jens Wiklander <jens.wiklander@xxxxxxxxxx>]

On Fri, Aug 2, 2019 at 4:20 AM <john.hubbard@xxxxxxxxx> wrote:
>
> From: John Hubbard <jhubbard@xxxxxxxxxx>
>
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
>
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
>
> Cc: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
> Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
> ---
>  drivers/tee/tee_shm.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)

Acked-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>

I suppose you're taking this via your own tree or such.

Thanks,
Jens

>
> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> index 2da026fd12c9..c967d0420b67 100644
> --- a/drivers/tee/tee_shm.c
> +++ b/drivers/tee/tee_shm.c
> @@ -31,16 +31,13 @@ static void tee_shm_release(struct tee_shm *shm)
>
>                 poolm->ops->free(poolm, shm);
>         } else if (shm->flags & TEE_SHM_REGISTER) {
> -               size_t n;
>                 int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
>
>                 if (rc)
>                         dev_err(teedev->dev.parent,
>                                 "unregister shm %p failed: %d", shm, rc);
>
> -               for (n = 0; n < shm->num_pages; n++)
> -                       put_page(shm->pages[n]);
> -
> +               put_user_pages(shm->pages, shm->num_pages);
>                 kfree(shm->pages);
>         }
>
> @@ -313,16 +310,13 @@ struct tee_shm *tee_shm_register(struct tee_context 
> *ctx, unsigned long addr,
>         return shm;
>  err:
>         if (shm) {
> -               size_t n;
> -
>                 if (shm->id >= 0) {
>                         mutex_lock(&teedev->mutex);
>                         idr_remove(&teedev->idr, shm->id);
>                         mutex_unlock(&teedev->mutex);
>                 }
>                 if (shm->pages) {
> -                       for (n = 0; n < shm->num_pages; n++)
> -                               put_page(shm->pages[n]);
> +                       put_user_pages(shm->pages, shm->num_pages);
>                         kfree(shm->pages);
>                 }
>         }
> --
> 2.22.0
>

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