[PATCH] media: cec: core: disable adapter in cec_devnode_unregister

[Hans Verkuil <hverkuil-cisco@xxxxxxxxx>]

Explicitly disable the CEC adapter in cec_devnode_unregister()

Usually this does not really do anything important, but for drivers
that use the CEC pin framework this is needed to properly stop the
hrtimer. Without this a crash would happen when such a driver is
unloaded with rmmod.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
---
 drivers/media/cec/core/cec-adap.c | 5 ++++-
 drivers/media/cec/core/cec-core.c | 2 ++
 drivers/media/cec/core/cec-priv.h | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c
index 769ea6b2e1d0..be0c38969479 100644
--- a/drivers/media/cec/core/cec-adap.c
+++ b/drivers/media/cec/core/cec-adap.c
@@ -1585,7 +1585,7 @@ static void cec_claim_log_addrs(struct cec_adapter *adap, bool block)
  *
  * This function is called with adap->lock held.
  */
-static int cec_adap_enable(struct cec_adapter *adap)
+int cec_adap_enable(struct cec_adapter *adap)
 {
 	bool enable;
 	int ret = 0;
@@ -1595,6 +1595,9 @@ static int cec_adap_enable(struct cec_adapter *adap)
 	if (adap->needs_hpd)
 		enable = enable && adap->phys_addr != CEC_PHYS_ADDR_INVALID;

+	if (adap->devnode.unregistered)
+		enable = false;
+
 	if (enable == adap->is_enabled)
 		return 0;

diff --git a/drivers/media/cec/core/cec-core.c b/drivers/media/cec/core/cec-core.c
index af358e901b5f..7e153c5cad04 100644
--- a/drivers/media/cec/core/cec-core.c
+++ b/drivers/media/cec/core/cec-core.c
@@ -191,6 +191,8 @@ static void cec_devnode_unregister(struct cec_adapter *adap)
 	mutex_lock(&adap->lock);
 	__cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
 	__cec_s_log_addrs(adap, NULL, false);
+	// Disable the adapter (since adap->devnode.unregistered is true)
+	cec_adap_enable(adap);
 	mutex_unlock(&adap->lock);

 	cdev_device_del(&devnode->cdev, &devnode->dev);
diff --git a/drivers/media/cec/core/cec-priv.h b/drivers/media/cec/core/cec-priv.h
index b78df931aa74..ed1f8c67626b 100644
--- a/drivers/media/cec/core/cec-priv.h
+++ b/drivers/media/cec/core/cec-priv.h
@@ -47,6 +47,7 @@ int cec_monitor_pin_cnt_inc(struct cec_adapter *adap);
 void cec_monitor_pin_cnt_dec(struct cec_adapter *adap);
 int cec_adap_status(struct seq_file *file, void *priv);
 int cec_thread_func(void *_adap);
+int cec_adap_enable(struct cec_adapter *adap);
 void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block);
 int __cec_s_log_addrs(struct cec_adapter *adap,
 		      struct cec_log_addrs *log_addrs, bool block);
-- 
2.39.2