linux-kernel - [PATCH v3 2/2] drm/panthor: Fix OPP refcnt leaks in devfreq initialisation

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Message-ID: <20241005160857.347796-2-adrian.larumbe@collabora.com>
Date: Sat,  5 Oct 2024 17:08:53 +0100
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Steven Price <steven.price@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Liviu Dudau <liviu.dudau@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>
Cc: kernel@...labora.com,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] drm/panthor: Fix OPP refcnt leaks in devfreq initialisation

Rearrange lookup of recommended OPP for the Mali GPU device and its refcnt
decremental to make sure no OPP object leaks happen in the error path.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
Fixes: fac9b22df4b1 ("drm/panthor: Add the devfreq logical block")
Reviewed-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/panthor/panthor_devfreq.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.c b/drivers/gpu/drm/panthor/panthor_devfreq.c
index 9d0f891b9b53..ecc7a52bd688 100644
--- a/drivers/gpu/drm/panthor/panthor_devfreq.c
+++ b/drivers/gpu/drm/panthor/panthor_devfreq.c
@@ -163,13 +163,6 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
 
 	cur_freq = clk_get_rate(ptdev->clks.core);
 
-	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
-	if (IS_ERR(opp))
-		return PTR_ERR(opp);
-
-	panthor_devfreq_profile.initial_freq = cur_freq;
-	ptdev->current_frequency = cur_freq;
-
 	/* Regulator coupling only takes care of synchronizing/balancing voltage
 	 * updates, but the coupled regulator needs to be enabled manually.
 	 *
@@ -200,18 +193,24 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
 		return ret;
 	}
 
+	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
+	if (IS_ERR(opp))
+		return PTR_ERR(opp);
+
+	panthor_devfreq_profile.initial_freq = cur_freq;
+	ptdev->current_frequency = cur_freq;
+
 	/*
 	 * Set the recommend OPP this will enable and configure the regulator
 	 * if any and will avoid a switch off by regulator_late_cleanup()
 	 */
 	ret = dev_pm_opp_set_opp(dev, opp);
+	dev_pm_opp_put(opp);
 	if (ret) {
 		DRM_DEV_ERROR(dev, "Couldn't set recommended OPP\n");
 		return ret;
 	}
 
-	dev_pm_opp_put(opp);
-
 	/* Find the fastest defined rate  */
 	opp = dev_pm_opp_find_freq_floor(dev, &freq);
 	if (IS_ERR(opp))
-- 
2.46.2