---

yaml
---
r: 250310
b: refs/heads/master
c: 08aeb7c
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 51ea62927e5bbb577360dd92c3f282edbf4cd3f8
+refs/heads/master: 08aeb7c9a42ab7aa8b53c8f7779ec58f860a565c

trunk/drivers/media/rc/rc-main.c

@@ -749,6 +749,9 @@ static struct {
  * it is trigged by reading /sys/class/rc/rc?/protocols.
  * It returns the protocol names of supported protocols.
  * Enabled protocols are printed in brackets.
+ *
+ * dev->lock is taken to guard against races between device
+ * registration, store_protocols and show_protocols.
  */
 static ssize_t show_protocols(struct device *device,
 			      struct device_attribute *mattr, char *buf)
@@ -762,6 +765,8 @@ static ssize_t show_protocols(struct device *device,
 	if (!dev)
 		return -EINVAL;
 
+	mutex_lock(&dev->lock);
+
 	if (dev->driver_type == RC_DRIVER_SCANCODE) {
 		enabled = dev->rc_map.rc_type;
 		allowed = dev->allowed_protos;
@@ -784,6 +789,9 @@ static ssize_t show_protocols(struct device *device,
 	if (tmp != buf)
 		tmp--;
 	*tmp = '\n';
+
+	mutex_unlock(&dev->lock);
+
 	return tmp + 1 - buf;
 }
 
@@ -802,6 +810,9 @@ static ssize_t show_protocols(struct device *device,
  * Writing "none" will disable all protocols.
  * Returns -EINVAL if an invalid protocol combination or unknown protocol name
  * is used, otherwise @len.
+ *
+ * dev->lock is taken to guard against races between device
+ * registration, store_protocols and show_protocols.
  */
 static ssize_t store_protocols(struct device *device,
 			       struct device_attribute *mattr,
@@ -815,18 +826,22 @@ static ssize_t store_protocols(struct device *device,
 	u64 mask;
 	int rc, i, count = 0;
 	unsigned long flags;
+	ssize_t ret;
 
 	/* Device is being removed */
 	if (!dev)
 		return -EINVAL;
 
+	mutex_lock(&dev->lock);
+
 	if (dev->driver_type == RC_DRIVER_SCANCODE)
 		type = dev->rc_map.rc_type;
 	else if (dev->raw)
 		type = dev->raw->enabled_protocols;
 	else {
 		IR_dprintk(1, "Protocol switching not supported\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto out;
 	}
 
 	while ((tmp = strsep((char **) &data, " \n")) != NULL) {
@@ -860,7 +875,8 @@ static ssize_t store_protocols(struct device *device,
 			}
 			if (i == ARRAY_SIZE(proto_names)) {
 				IR_dprintk(1, "Unknown protocol: '%s'\n", tmp);
-				return -EINVAL;
+				ret = -EINVAL;
+				goto out;
 			}
 			count++;
 		}
@@ -875,15 +891,17 @@ static ssize_t store_protocols(struct device *device,
 
 	if (!count) {
 		IR_dprintk(1, "Protocol not specified\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto out;
 	}
 
 	if (dev->change_protocol) {
 		rc = dev->change_protocol(dev, type);
 		if (rc < 0) {
 			IR_dprintk(1, "Error setting protocols to 0x%llx\n",
 				   (long long)type);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto out;
 		}
 	}
 
@@ -898,7 +916,11 @@ static ssize_t store_protocols(struct device *device,
 	IR_dprintk(1, "Current protocol(s): 0x%llx\n",
 		   (long long)type);
 
-	return len;
+	ret = len;
+
+out:
+	mutex_unlock(&dev->lock);
+	return ret;
 }
 
 static void rc_dev_release(struct device *device)
@@ -974,6 +996,7 @@ struct rc_dev *rc_allocate_device(void)
 
 	spin_lock_init(&dev->rc_map.lock);
 	spin_lock_init(&dev->keylock);
+	mutex_init(&dev->lock);
 	setup_timer(&dev->timer_keyup, ir_timer_keyup, (unsigned long)dev);
 
 	dev->dev.type = &rc_dev_type;
@@ -1019,12 +1042,21 @@ int rc_register_device(struct rc_dev *dev)
 	if (dev->close)
 		dev->input_dev->close = ir_close;
 
+	/*
+	 * Take the lock here, as the device sysfs node will appear
+	 * when device_add() is called, which may trigger an ir-keytable udev
+	 * rule, which will in turn call show_protocols and access either
+	 * dev->rc_map.rc_type or dev->raw->enabled_protocols before it has
+	 * been initialized.
+	 */
+	mutex_lock(&dev->lock);
+
 	dev->devno = (unsigned long)(atomic_inc_return(&devno) - 1);
 	dev_set_name(&dev->dev, "rc%ld", dev->devno);
 	dev_set_drvdata(&dev->dev, dev);
 	rc = device_add(&dev->dev);
 	if (rc)
-		return rc;
+		goto out_unlock;
 
 	rc = ir_setkeytable(dev, rc_map);
 	if (rc)
@@ -1058,6 +1090,7 @@ int rc_register_device(struct rc_dev *dev)
 		if (rc < 0)
 			goto out_input;
 	}
+	mutex_unlock(&dev->lock);
 
 	if (dev->change_protocol) {
 		rc = dev->change_protocol(dev, rc_map->rc_type);
@@ -1083,6 +1116,8 @@ int rc_register_device(struct rc_dev *dev)
 	ir_free_table(&dev->rc_map);
 out_dev:
 	device_del(&dev->dev);
+out_unlock:
+	mutex_unlock(&dev->lock);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(rc_register_device);

trunk/include/media/rc-core.h

@@ -40,10 +40,12 @@ enum rc_driver_type {
  * @driver_name: name of the hardware driver which registered this device
  * @map_name: name of the default keymap
  * @rc_map: current scan/key table
+ * @lock: used to ensure we've filled in all protocol details before
+ *	anyone can call show_protocols or store_protocols
  * @devno: unique remote control device number
  * @raw: additional data for raw pulse/space devices
  * @input_dev: the input child device used to communicate events to userspace
- * @driver_type: specifies if protocol decoding is done in hardware or software 
+ * @driver_type: specifies if protocol decoding is done in hardware or software
  * @idle: used to keep track of RX state
  * @allowed_protos: bitmask with the supported RC_TYPE_* protocols
  * @scanmask: some hardware decoders are not capable of providing the full
@@ -86,7 +88,8 @@ struct rc_dev {
 	struct input_id			input_id;
 	char				*driver_name;
 	const char			*map_name;
-	struct rc_map	rc_map;
+	struct rc_map			rc_map;
+	struct mutex			lock;
 	unsigned long			devno;
 	struct ir_raw_event_ctrl	*raw;
 	struct input_dev		*input_dev;