---

yaml
---
r: 329230
b: refs/heads/master
c: 4d50c44
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 35202f7d8420fff586b372422a2419affeaba8ef
+refs/heads/master: 4d50c44381c981c9caa74e82ab894d4938dac9ca

trunk/drivers/firewire/core-transaction.c

@@ -519,7 +519,7 @@ static struct fw_address_handler *lookup_enclosing_address_handler(
 	return NULL;
 }
 
-static DEFINE_SPINLOCK(address_handler_lock);
+static DEFINE_SPINLOCK(address_handler_list_lock);
 static LIST_HEAD(address_handler_list);
 
 const struct fw_address_region fw_high_memory_region =
@@ -556,6 +556,7 @@ static bool is_in_fcp_region(u64 offset, size_t length)
  * the specified callback is invoked.  The parameters passed to the callback
  * give the details of the particular request.
  *
+ * To be called in process context.
  * Return value:  0 on success, non-zero otherwise.
  *
  * The start offset of the handler's address region is determined by
@@ -576,7 +577,7 @@ int fw_core_add_address_handler(struct fw_address_handler *handler,
 	    handler->length == 0)
 		return -EINVAL;
 
-	spin_lock_bh(&address_handler_lock);
+	spin_lock(&address_handler_list_lock);
 
 	handler->offset = region->start;
 	while (handler->offset + handler->length <= region->end) {
@@ -595,7 +596,7 @@ int fw_core_add_address_handler(struct fw_address_handler *handler,
 		}
 	}
 
-	spin_unlock_bh(&address_handler_lock);
+	spin_unlock(&address_handler_list_lock);
 
 	return ret;
 }
@@ -604,14 +605,16 @@ EXPORT_SYMBOL(fw_core_add_address_handler);
 /**
  * fw_core_remove_address_handler() - unregister an address handler
  *
+ * To be called in process context.
+ *
  * When fw_core_remove_address_handler() returns, @handler->callback() is
  * guaranteed to not run on any CPU anymore.
  */
 void fw_core_remove_address_handler(struct fw_address_handler *handler)
 {
-	spin_lock_bh(&address_handler_lock);
+	spin_lock(&address_handler_list_lock);
 	list_del_rcu(&handler->link);
-	spin_unlock_bh(&address_handler_lock);
+	spin_unlock(&address_handler_list_lock);
 	synchronize_rcu();
 }
 EXPORT_SYMBOL(fw_core_remove_address_handler);

trunk/include/linux/firewire.h

@@ -265,8 +265,16 @@ typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
 					  void *data, size_t length,
 					  void *callback_data);
 /*
- * Important note:  Except for the FCP registers, the callback must guarantee
- * that either fw_send_response() or kfree() is called on the @request.
+ * This callback handles an inbound request subaction.  It is called in
+ * RCU read-side context, therefore must not sleep.
+ *
+ * The callback should not initiate outbound request subactions directly.
+ * Otherwise there is a danger of recursion of inbound and outbound
+ * transactions from and to the local node.
+ *
+ * The callback is responsible that either fw_send_response() or kfree()
+ * is called on the @request, except for FCP registers for which the core
+ * takes care of that.
  */
 typedef void (*fw_address_callback_t)(struct fw_card *card,
 				      struct fw_request *request,