linux-kernel - [PATCH] media: au0828 fix to clear enable/disable/change source handlers

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Date:	Sat, 12 Mar 2016 20:57:40 -0700
From:	Shuah Khan <shuahkh@....samsung.com>
To:	mchehab@....samsung.com, hans.verkuil@...co.com,
	chehabrafael@...il.com
Cc:	Shuah Khan <shuahkh@....samsung.com>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] media: au0828 fix to clear enable/disable/change source handlers

Fix to clear enable/disable/change source handlers in the media device
when media device is unregistered in au0828_unregister_media_device().
When au0828 module is removed, snd-usb-audio shouldn't call the handlers.
Clearing will ensure snd-usb-audio won't call them once au0828 is removed.

Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
---
 drivers/media/usb/au0828/au0828-core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index de9ab11..abdb956 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -137,6 +137,12 @@ static void au0828_unregister_media_device(struct au0828_dev *dev)
 #ifdef CONFIG_MEDIA_CONTROLLER
 	if (dev->media_dev &&
 		media_devnode_is_registered(&dev->media_dev->devnode)) {
+		/* clear enable_source, disable_source, change_source */
+		dev->media_dev->source_priv = NULL;
+		dev->media_dev->enable_source = NULL;
+		dev->media_dev->disable_source = NULL;
+		dev->media_dev->change_source = NULL;
+
 		media_device_unregister(dev->media_dev);
 		media_device_cleanup(dev->media_dev);
 		dev->media_dev = NULL;
-- 
2.5.0