linux-kernel - [PATCH 1/2] drm/vc4: hdmi: Fix error path of hpd-gpios

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Message-Id: <20210524131852.263883-1-maxime@cerno.tech>
Date:   Mon, 24 May 2021 15:18:51 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>
Cc:     Eric Anholt <eric@...olt.net>, linux-kernel@...r.kernel.org,
        Linus Wallei <linus.walleij@...aro.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dom Cobley <dom@...pberrypi.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 1/2] drm/vc4: hdmi: Fix error path of hpd-gpios

If the of_get_named_gpio_flags call fails in vc4_hdmi_bind, we jump to
the err_unprepare_hsm label. That label will then call
pm_runtime_disable and put_device on the DDC device.

We just retrieved the DDC device, so the latter is definitely justified.
However at that point we still haven't called pm_runtime_enable, so the
call to pm_runtime_disable is not supposed to be there.

Fixes: 10ee275cb12f ("drm/vc4: prepare for CEC support")
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index c27b287d2053..ccc6c8079dc6 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -2039,7 +2039,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
 							     &hpd_gpio_flags);
 		if (vc4_hdmi->hpd_gpio < 0) {
 			ret = vc4_hdmi->hpd_gpio;
-			goto err_unprepare_hsm;
+			goto err_put_ddc;
 		}
 
 		vc4_hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW;
@@ -2080,8 +2080,8 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
 	vc4_hdmi_connector_destroy(&vc4_hdmi->connector);
 err_destroy_encoder:
 	drm_encoder_cleanup(encoder);
-err_unprepare_hsm:
 	pm_runtime_disable(dev);
+err_put_ddc:
 	put_device(&vc4_hdmi->ddc->dev);
 
 	return ret;
-- 
2.31.1