[v4,2/2] drm/panthor: Fix OPP refcnt leaks in devfreq initialisation

Commit Message

Adrián Larumbe Nov. 5, 2024, 8:54 p.m. UTC

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 <[e-mail]>
Fixes: fac9b22df4b1 ("drm/panthor: Add the devfreq logical block")
Reviewed-by: Steven Price <[e-mail]>
Reviewed-by: Liviu Dudau <[e-mail]>
---
 drivers/gpu/drm/panthor/panthor_devfreq.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

Patch

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))