releases/5.10.50/media-am437x-fix-pm_runtime_get_sync-usage-count.patch

From d08357cc0f190f229ec2836c54452814de83e824 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 23 Apr 2021 17:05:27 +0200
Subject: media: am437x: fix pm_runtime_get_sync() usage count

From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

[ Upstream commit c41e02493334985cca1a22efd5ca962ce3abb061 ]

The pm_runtime_get_sync() internally increments the
dev->power.usage_count without decrementing it, even on errors.
Replace it by the new pm_runtime_resume_and_get(), introduced by:
commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
in order to properly decrement the usage counter, avoiding
a potential PM usage counter leak.

While here, ensure that the driver will check if PM runtime
resumed at vpfe_initialize_device().

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/platform/am437x/am437x-vpfe.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
index 0fb9f9ba1219..31cee69adbe1 100644
--- a/drivers/media/platform/am437x/am437x-vpfe.c
+++ b/drivers/media/platform/am437x/am437x-vpfe.c
@@ -1021,7 +1021,9 @@ static int vpfe_initialize_device(struct vpfe_device *vpfe)
 	if (ret)
 		return ret;
 
-	pm_runtime_get_sync(vpfe->pdev);
+	ret = pm_runtime_resume_and_get(vpfe->pdev);
+	if (ret < 0)
+		return ret;
 
 	vpfe_config_enable(&vpfe->ccdc, 1);
 
@@ -2443,7 +2445,11 @@ static int vpfe_probe(struct platform_device *pdev)
 	pm_runtime_enable(&pdev->dev);
 
 	/* for now just enable it here instead of waiting for the open */
-	pm_runtime_get_sync(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret < 0) {
+		vpfe_err(vpfe, "Unable to resume device.\n");
+		goto probe_out_v4l2_unregister;
+	}
 
 	vpfe_ccdc_config_defaults(ccdc);
 
@@ -2530,6 +2536,11 @@ static int vpfe_suspend(struct device *dev)
 
 	/* only do full suspend if streaming has started */
 	if (vb2_start_streaming_called(&vpfe->buffer_queue)) {
+		/*
+		 * ignore RPM resume errors here, as it is already too late.
+		 * A check like that should happen earlier, either at
+		 * open() or just before start streaming.
+		 */
 		pm_runtime_get_sync(dev);
 		vpfe_config_enable(ccdc, 1);
 
-- 
2.30.2