[PATCH] dma-buf/resv: fix exclusive fence get

[Chris Wilson]

Quoting Qiang Yu (2019-09-22 08:49:00)
> This causes kernel crash when testing lima driver.
> 
> Cc: Christian König <christian.koenig at amd.com>
> Fixes: b8c036dfc66f ("dma-buf: simplify reservation_object_get_fences_rcu a bit")
> Signed-off-by: Qiang Yu <yuq825 at gmail.com>
> ---
>  drivers/dma-buf/dma-resv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
> index 42a8f3f11681..709002515550 100644
> --- a/drivers/dma-buf/dma-resv.c
> +++ b/drivers/dma-buf/dma-resv.c
> @@ -471,7 +471,7 @@ int dma_resv_get_fences_rcu(struct dma_resv *obj,
>         if (pfence_excl)
>                 *pfence_excl = fence_excl;
>         else if (fence_excl)
> -               shared[++shared_count] = fence_excl;
> +               shared[shared_count++] = fence_excl;

Oops.

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris