linux-kernel - [PATCH AUTOSEL 5.12 035/160] drm/vc4: hdmi: Fix PM reference leak in vc4_hdmi_encoder_pre_crtc

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Message-Id: <20210706111827.2060499-35-sashal@kernel.org>
Date:   Tue,  6 Jul 2021 07:16:21 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zou Wei <zou_wei@...wei.com>, Hulk Robot <hulkci@...wei.com>,
        Maxime Ripard <maxime@...no.tech>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.12 035/160] drm/vc4: hdmi: Fix PM reference leak in vc4_hdmi_encoder_pre_crtc_co()

From: Zou Wei <zou_wei@...wei.com>

[ Upstream commit 5e4322a8b266bc9f5ee7ea4895f661c01dbd7cb3 ]

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zou Wei <zou_wei@...wei.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/1621840854-105978-1-git-send-email-zou_wei@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 8106b5634fe1..d1c9819ea9f9 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -745,7 +745,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 	unsigned long pixel_rate, hsm_rate;
 	int ret;
 
-	ret = pm_runtime_get_sync(&vc4_hdmi->pdev->dev);
+	ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev);
 	if (ret < 0) {
 		DRM_ERROR("Failed to retain power domain: %d\n", ret);
 		return;
-- 
2.30.2