linux-kernel - [PATCH v2] drm/v3d: Fix PM disable depth imbalance in v3d_platform_drm

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Message-Id: <20220106124657.32737-1-linmq006@gmail.com>
Date:   Thu,  6 Jan 2022 12:46:57 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     dave.stevenson@...pberrypi.com
Cc:     airlied@...ux.ie, dri-devel@...ts.freedesktop.org, emma@...olt.net,
        eric@...olt.net, linmq006@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/v3d: Fix PM disable depth imbalance in v3d_platform_drm_probe

The pm_runtime_enable will increase power disable depth.
If the probe fails, we should use pm_runtime_disable() to balance
pm_runtime_enable().

Fixes: 57692c9 ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
Changes in v2
- put pm_runtime_disable before dma_free_wc
- rename dma_free to pm_disable
---
 drivers/gpu/drm/v3d/v3d_drv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index bd46396a1ae0..7d500dd5314e 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -282,7 +282,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 
 	ret = v3d_gem_init(drm);
 	if (ret)
-		goto dma_free;
+		goto pm_disable;
 
 	ret = v3d_irq_init(v3d);
 	if (ret)
@@ -298,7 +298,8 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	v3d_irq_disable(v3d);
 gem_destroy:
 	v3d_gem_destroy(drm);
-dma_free:
+pm_disable:
+	pm_runtime_disable(dev);
 	dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 	return ret;
 }
-- 
2.17.1