Kernel Oops dw2102

dw2102.patch

diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c
index 346946f..0aa19cd 100644
--- a/drivers/media/usb/dvb-usb/dw2102.c
+++ b/drivers/media/usb/dvb-usb/dw2102.c
@@ -2425,18 +2425,20 @@ static void dw2102_disconnect(struct usb_interface *intf)
 	struct dw2102_state *st = (struct dw2102_state *)d->priv;
 	struct i2c_client *client;
 
-	/* remove I2C client for tuner */
-	client = st->i2c_client_tuner;
-	if (client) {
-		module_put(client->dev.driver->owner);
-		i2c_unregister_device(client);
-	}
+	if (st) {
+		/* remove I2C client for tuner */
+		client = st->i2c_client_tuner;
+		if (client) {
+			module_put(client->dev.driver->owner);
+			i2c_unregister_device(client);
+		}
 
-	/* remove I2C client for demodulator */
-	client = st->i2c_client_demod;
-	if (client) {
-		module_put(client->dev.driver->owner);
-		i2c_unregister_device(client);
+		/* remove I2C client for demodulator */
+		client = st->i2c_client_demod;
+		if (client) {
+			module_put(client->dev.driver->owner);
+			i2c_unregister_device(client);
+		}
 	}
 
 	dvb_usb_device_exit(intf);

Patch source: https://bugzilla.kernel.org/show_bug.cgi?id=197731

As root:

apt install flex bison libelf-dev

KSRCVER=$(uname -r | sed 's/-.*$//')
apt install linux-source-$KSRCVER
cd /usr/src/linux-source-$KSRCVER
tar -xf linux-source-$KSRCVER.tar.bz2
cd linux-source-$KSRCVER

make oldconfig
make prepare
make scripts

cp -v /usr/src/linux-headers-$(uname -r)/Module.symvers .

patch -p1 <path/to/dw2102.patch

make M=drivers/media/usb/dvb-usb modules

/usr/src/linux-headers-$(uname -r)/scripts/sign-file sha512 /var/lib/shim-signed/mok/MOK.{priv,der} drivers/media/usb/dvb-usb/dvb-usb-dw2102.ko

cp drivers/media/usb/dvb-usb/dvb-usb-dw2102.ko /lib/modules/$(uname -r)/updates/
depmod

Get firmware from https://github.com/OpenELEC/dvb-firmware

Scan with w_scan. E.g. w_scan -f s -s S28E2 for UK Freesat