linux-kernel - [PATCH v3] media: cros-ec-cec: do not bail on device_init

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Date:   Fri, 26 Jun 2020 14:48:06 +0200
From:   Dariusz Marcinkiewicz <darekm@...gle.com>
To:     linux-media@...r.kernel.org, hverkuil-cisco@...all.nl
Cc:     gwendal@...omium.org, Dariusz Marcinkiewicz <darekm@...gle.com>,
        stable@...r.kernel.org, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Sebastian Reichel <sre@...nel.org>,
        Dariusz Marcinkiewicz <darekm@...omium.org>,
        Lee Jones <lee.jones@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3] media: cros-ec-cec: do not bail on device_init_wakeup failure

Do not fail probing when device_init_wakeup fails. Also clear wakeup
on remove.

device_init_wakeup fails when the device is already enabled as wakeup
device. Hence, the driver fails to probe the device if:
- The device has already been enabled for wakeup (via /proc/acpi/wakeup)
- The driver has been unloaded and is being loaded again.

This goal of the patch is to fix the above cases.

Overwhelming majority of the drivers do not consider device_init_wakeup
failure as a fatal error and proceed regardless of whether it succeeds
or not.

Changes since v2:
 - disabled wakeup in remove
 - CC'ing stable
 - description fixed
Changes since v1:
 - added Fixes tag

Fixes: cd70de2d356ee ("media: platform: Add ChromeOS EC CEC driver")
Cc: stable@...r.kernel.org
Signed-off-by: Dariusz Marcinkiewicz <darekm@...gle.com>
---
 drivers/media/cec/platform/cros-ec/cros-ec-cec.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
index 0e7e2772f08f..3881ed7bc3d9 100644
--- a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
+++ b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
@@ -277,12 +277,6 @@ static int cros_ec_cec_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, cros_ec_cec);
 	cros_ec_cec->cros_ec = cros_ec;
 
-	ret = device_init_wakeup(&pdev->dev, 1);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to initialize wakeup\n");
-		return ret;
-	}
-
 	cros_ec_cec->adap = cec_allocate_adapter(&cros_ec_cec_ops, cros_ec_cec,
 						 DRV_NAME,
 						 CEC_CAP_DEFAULTS |
@@ -310,6 +304,8 @@ static int cros_ec_cec_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto out_probe_notify;
 
+	device_init_wakeup(&pdev->dev, 1);
+
 	return 0;
 
 out_probe_notify:
@@ -339,6 +335,8 @@ static int cros_ec_cec_remove(struct platform_device *pdev)
 					 cros_ec_cec->adap);
 	cec_unregister_adapter(cros_ec_cec->adap);
 
+	device_init_wakeup(&pdev->dev, 0);
+
 	return 0;
 }
 
-- 
2.27.0.212.ge8ba1cc988-goog