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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
To:     Andy Shevchenko <andy.shevchenko@gmail.com>,
        Daniel Scally <djrscally@gmail.com>,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Yong Zhi <yong.zhi@intel.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Bingbu Cao <bingbu.cao@intel.com>,
        Tianshu Qiu <tian.shu.qiu@intel.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>
Subject: [PATCH v1 1/1] media: ipu3-cio2: Fix referece counting when looping over ACPI devices
Date:   Sun,  4 Apr 2021 21:14:09 +0300
Message-Id: <20210404181409.1451026-1-andy.shevchenko@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

When we continue, due to device is disabled, loop we have to drop reference count.
When we have an array full of devices we have to also drop the reference count.
Note, in this case the cio2_bridge_unregister_sensors() is called by the caller.

Fixes: 803abec64ef9 ("media: ipu3-cio2: Add cio2-bridge to ipu3-cio2 driver")
Cc: Daniel Scally <djrscally@gmail.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
 drivers/media/pci/intel/ipu3/cio2-bridge.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/media/pci/intel/ipu3/cio2-bridge.c b/drivers/media/pci/intel/ipu3/cio2-bridge.c
index c2199042d3db..85f8b587405e 100644
--- a/drivers/media/pci/intel/ipu3/cio2-bridge.c
+++ b/drivers/media/pci/intel/ipu3/cio2-bridge.c
@@ -173,14 +173,15 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
 	int ret;
 
 	for_each_acpi_dev_match(adev, cfg->hid, NULL, -1) {
-		if (!adev->status.enabled)
+		if (!adev->status.enabled) {
+			acpi_dev_put(adev);
 			continue;
+		}
 
 		if (bridge->n_sensors >= CIO2_NUM_PORTS) {
+			acpi_dev_put(adev);
 			dev_err(&cio2->dev, "Exceeded available CIO2 ports\n");
-			cio2_bridge_unregister_sensors(bridge);
-			ret = -EINVAL;
-			goto err_out;
+			return -EINVAL;
 		}
 
 		sensor = &bridge->sensors[bridge->n_sensors];
@@ -228,7 +229,6 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
 	software_node_unregister_nodes(sensor->swnodes);
 err_put_adev:
 	acpi_dev_put(sensor->adev);
-err_out:
 	return ret;
 }
 
-- 
2.31.1