linux-kernel - [PATCH 1/2] drm: encoder_slave: fix refcouting error for modules

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Date:   Mon, 16 Mar 2020 17:39:06 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-renesas-soc@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Francisco Jerez <currojerez@...eup.net>,
        Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] drm: encoder_slave: fix refcouting error for modules

module_put() balances try_module_get(), not request_module(). Fix the
error path to match that.

Fixes: 2066facca4c7 ("drm/kms: slave encoder interface.")
Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 drivers/gpu/drm/drm_encoder_slave.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_encoder_slave.c b/drivers/gpu/drm/drm_encoder_slave.c
index cf804389f5ec..d50a7884e69e 100644
--- a/drivers/gpu/drm/drm_encoder_slave.c
+++ b/drivers/gpu/drm/drm_encoder_slave.c
@@ -84,7 +84,7 @@ int drm_i2c_encoder_init(struct drm_device *dev,
 
 	err = encoder_drv->encoder_init(client, dev, encoder);
 	if (err)
-		goto fail_unregister;
+		goto fail_module_put;
 
 	if (info->platform_data)
 		encoder->slave_funcs->set_config(&encoder->base,
@@ -92,9 +92,10 @@ int drm_i2c_encoder_init(struct drm_device *dev,
 
 	return 0;
 
+fail_module_put:
+	module_put(module);
 fail_unregister:
 	i2c_unregister_device(client);
-	module_put(module);
 fail:
 	return err;
 }
-- 
2.20.1