media: dvb: i2c transfers over usb cannot be done from stack

Cc: [email protected] Signed-off-by: Laurent Caumont <[email protected]> Signed-off-by: Sean Young <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
kmaincent · Nov 30, 2017 · 6d33377 · 6d33377
1 parent be9b53c
commit 6d33377
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/drivers/media/usb/dvb-usb/dibusb-common.c b/drivers/media/usb/dvb-usb/dibusb-common.c
@@ -223,8 +223,20 @@ EXPORT_SYMBOL(dibusb_i2c_algo);
 
 int dibusb_read_eeprom_byte(struct dvb_usb_device *d, u8 offs, u8 *val)
 {
-	u8 wbuf[1] = { offs };
-	return dibusb_i2c_msg(d, 0x50, wbuf, 1, val, 1);
+	u8 *buf;
+	int rc;
+
+	buf = kmalloc(2, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	buf[0] = offs;
+
+	rc = dibusb_i2c_msg(d, 0x50, &buf[0], 1, &buf[1], 1);
+	*val = buf[1];
+	kfree(buf);
+
+	return rc;
 }
 EXPORT_SYMBOL(dibusb_read_eeprom_byte);