On Monday, 2017-08-21 14:42:51 +0200, Philipp Zabel wrote:
> If drmPrimeFDToHandle fails in etna_bo_from_dmabuf, the function must
> not return with the table_lock mutex held. There is no reason to call
> drmPrimeFDToHandle under that lock, so just take the lock after trying
> to obtain the handle.
>
> Based on ceb70a6b1015 ("freedreno: prevent deadlock in error path").
>
> Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
Reviewed-by: Eric Engestrom <eric.engest...@imgtec.com>
> ---
> v2: keep lock around drmPrimeFDToHandle call
> ---
> etnaviv/etnaviv_bo.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/etnaviv/etnaviv_bo.c b/etnaviv/etnaviv_bo.c
> index 0cc3ab97..86fb894b 100644
> --- a/etnaviv/etnaviv_bo.c
> +++ b/etnaviv/etnaviv_bo.c
> @@ -225,10 +225,15 @@ struct etna_bo *etna_bo_from_dmabuf(struct etna_device
> *dev, int fd)
> int ret, size;
> uint32_t handle;
>
> + /* take the lock before calling drmPrimeFDToHandle to avoid
> + * racing against etna_bo_del, which might invalidate the
> + * returned handle.
> + */
> pthread_mutex_lock(&table_lock);
>
> ret = drmPrimeFDToHandle(dev->fd, fd, &handle);
> if (ret) {
> + pthread_mutex_unlock(&table_lock);
> return NULL;
> }
>
> --
> 2.11.0
>
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