linux-kernel - [PATCH 5.4 090/183] drm/tegra: output: Fix missing i2c_put_adapter() in the error handling paths of tegra_output

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Date: Sun, 24 Mar 2024 19:45:03 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Thierry Reding <treding@...dia.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 090/183] drm/tegra: output: Fix missing i2c_put_adapter() in the error handling paths of tegra_output_probe()

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

[ Upstream commit 2db4578ef6ffb2b52115ca0ebf897b60ec559556 ]

If an error occurs after a successful of_get_i2c_adapter_by_node() call, it
should be undone by a corresponding i2c_put_adapter().

Add the missing i2c_put_adapter() call.

Fixes: 9be7d864cf07 ("drm/tegra: Implement panel support")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Thierry Reding <treding@...dia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b38604178991e1f08b2cda219103be266be2d680.1693667005.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/tegra/output.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
index bdcaa4c7168cf..806249c0b7e85 100644
--- a/drivers/gpu/drm/tegra/output.c
+++ b/drivers/gpu/drm/tegra/output.c
@@ -127,8 +127,10 @@ int tegra_output_probe(struct tegra_output *output)
 						       GPIOD_IN,
 						       "HDMI hotplug detect");
 	if (IS_ERR(output->hpd_gpio)) {
-		if (PTR_ERR(output->hpd_gpio) != -ENOENT)
-			return PTR_ERR(output->hpd_gpio);
+		if (PTR_ERR(output->hpd_gpio) != -ENOENT) {
+			err = PTR_ERR(output->hpd_gpio);
+			goto put_i2c;
+		}
 
 		output->hpd_gpio = NULL;
 	}
@@ -137,7 +139,7 @@ int tegra_output_probe(struct tegra_output *output)
 		err = gpiod_to_irq(output->hpd_gpio);
 		if (err < 0) {
 			dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
-			return err;
+			goto put_i2c;
 		}
 
 		output->hpd_irq = err;
@@ -150,7 +152,7 @@ int tegra_output_probe(struct tegra_output *output)
 		if (err < 0) {
 			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
 				output->hpd_irq, err);
-			return err;
+			goto put_i2c;
 		}
 
 		output->connector.polled = DRM_CONNECTOR_POLL_HPD;
@@ -168,6 +170,12 @@ int tegra_output_probe(struct tegra_output *output)
 		return -ENOMEM;
 
 	return 0;
+
+put_i2c:
+	if (output->ddc)
+		i2c_put_adapter(output->ddc);
+
+	return err;
 }
 
 void tegra_output_remove(struct tegra_output *output)
-- 
2.43.0