linux-kernel - [PATCH 1/4] media: nuvoton: Fix reference handling of ece

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Message-Id: <20250121-nuvoton-v1-1-1ea4f0cdbda2@chromium.org>
Date: Tue, 21 Jan 2025 21:14:50 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Joseph Liu <kwliu@...oton.com>, Marvin Lin <kflin@...oton.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Hans Verkuil <hverkuil@...all.nl>, Philipp Zabel <p.zabel@...gutronix.de>
Cc: Marvin Lin <milkfafa@...il.com>, linux-media@...r.kernel.org, 
 openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>, stable@...r.kernel.org
Subject: [PATCH 1/4] media: nuvoton: Fix reference handling of ece_pdev

When we obtain a reference to of a platform_device, we need to release
it via put_device.

Found by cocci:
./platform/nuvoton/npcm-video.c:1677:3-9: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.
./platform/nuvoton/npcm-video.c:1684:3-9: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.
./platform/nuvoton/npcm-video.c:1690:3-9: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.
./platform/nuvoton/npcm-video.c:1694:1-7: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.

Cc: stable@...r.kernel.org
Fixes: 46c15a4ff1f4 ("media: nuvoton: Add driver for NPCM video capture and encoding engine")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/platform/nuvoton/npcm-video.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/nuvoton/npcm-video.c b/drivers/media/platform/nuvoton/npcm-video.c
index 024cd8ee1709..7b4c23dbe709 100644
--- a/drivers/media/platform/nuvoton/npcm-video.c
+++ b/drivers/media/platform/nuvoton/npcm-video.c
@@ -1673,6 +1673,7 @@ static int npcm_video_ece_init(struct npcm_video *video)
 
 		regs = devm_platform_ioremap_resource(ece_pdev, 0);
 		if (IS_ERR(regs)) {
+			put_device(&ece_pdev->dev);
 			dev_err(dev, "Failed to parse ECE reg in DTS\n");
 			return PTR_ERR(regs);
 		}
@@ -1680,11 +1681,13 @@ static int npcm_video_ece_init(struct npcm_video *video)
 		video->ece.regmap = devm_regmap_init_mmio(dev, regs,
 							  &npcm_video_ece_regmap_cfg);
 		if (IS_ERR(video->ece.regmap)) {
+			put_device(&ece_pdev->dev);
 			dev_err(dev, "Failed to initialize ECE regmap\n");
 			return PTR_ERR(video->ece.regmap);
 		}
 
 		video->ece.reset = devm_reset_control_get(&ece_pdev->dev, NULL);
+		put_device(&ece_pdev->dev);
 		if (IS_ERR(video->ece.reset)) {
 			dev_err(dev, "Failed to get ECE reset control in DTS\n");
 			return PTR_ERR(video->ece.reset);

-- 
2.48.0.rc2.279.g1de40edade-goog