Hi,
On Tue, Apr 12, 2022 at 07:04:57AM +0000, Miaoqian Lin wrote:
> If the device is already in a runtime PM enabled state
> pm_runtime_get_sync() will return 1, so a test for negative
> value should be used to check for errors.
>
> Fixes: 4078f5757144 ("drm/vc4: Add DSI driver")
> Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
> ---
> drivers/gpu/drm/vc4/vc4_dsi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
> index 752f921735c6..26aa7d1fa421 100644
> --- a/drivers/gpu/drm/vc4/vc4_dsi.c
> +++ b/drivers/gpu/drm/vc4/vc4_dsi.c
> @@ -847,7 +847,7 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
> int ret;
>
> ret = pm_runtime_get_sync(dev);
> - if (ret) {
> + if (ret < 0) {
> DRM_ERROR("Failed to runtime PM enable on DSI%d\n", dsi->variant->port);
> return;
> }
We also don't put back our reference after an error. I think a better
fix would be to switch to pm_runtime_resume_and_get.
Maxime
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