linux-kernel - [PATCH 5.15 097/171] drm/msm/dsi: Fix missing put_device() call in dsi_get

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Message-Id: <20220131105233.316426858@linuxfoundation.org>
Date:   Mon, 31 Jan 2022 11:56:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH 5.15 097/171] drm/msm/dsi: Fix missing put_device() call in dsi_get_phy

From: Miaoqian Lin <linmq006@...il.com>

commit c04c3148ca12227d92f91b355b4538cc333c9922 upstream.

If of_find_device_by_node() succeeds, dsi_get_phy() doesn't
a corresponding put_device(). Thus add put_device() to fix the exception
handling.

Fixes: ec31abf ("drm/msm/dsi: Separate PHY to another platform device")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Link: https://lore.kernel.org/r/20211230070943.18116-1-linmq006@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/msm/dsi/dsi.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -40,7 +40,12 @@ static int dsi_get_phy(struct msm_dsi *m
 
 	of_node_put(phy_node);
 
-	if (!phy_pdev || !msm_dsi->phy) {
+	if (!phy_pdev) {
+		DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
+		return -EPROBE_DEFER;
+	}
+	if (!msm_dsi->phy) {
+		put_device(&phy_pdev->dev);
 		DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
 		return -EPROBE_DEFER;
 	}