linux-kernel - [PATCH] drm/panfrost: Add missing OPP table refcnt decremental

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Message-ID: <20241003002603.3177741-1-adrian.larumbe@collabora.com>
Date: Thu,  3 Oct 2024 01:25:37 +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>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: kernel@...labora.com,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/panfrost: Add missing OPP table refcnt decremental

Commit f11b0417eec2 ("drm/panfrost: Add fdinfo support GPU load metrics")
retrieves the OPP for the maximum device clock frequency, but forgets to
keep the reference count balanced by putting the returned OPP object. This
eventually leads to an OPP core warning when removing the device.

Fix it by putting OPP objects as many times as they're retrieved.
Also remove an unnecessary whitespace.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
Fixes: f11b0417eec2 ("drm/panfrost: Add fdinfo support GPU load metrics")
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 2d30da38c2c3..c7d3f980f1e5 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -38,7 +38,7 @@ static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
 		return PTR_ERR(opp);
 	dev_pm_opp_put(opp);
 
-	err =  dev_pm_opp_set_rate(dev, *freq);
+	err = dev_pm_opp_set_rate(dev, *freq);
 	if (!err)
 		ptdev->pfdevfreq.current_frequency = *freq;
 
@@ -177,6 +177,8 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	 */
 	pfdevfreq->current_frequency = cur_freq;
 
+	dev_pm_opp_put(opp);
+
 	/*
 	 * Set the recommend OPP this will enable and configure the regulator
 	 * if any and will avoid a switch off by regulator_late_cleanup()
-- 
2.46.2