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-rw-r--r--drivers/xen/xenbus/xenbus_client.c66
1 files changed, 39 insertions, 27 deletions
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index d4b2519257..51b3124b0d 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -116,14 +116,17 @@ EXPORT_SYMBOL_GPL(xenbus_strstate);
* @dev: xenbus device
* @path: path to watch
* @watch: watch to register
+ * @will_handle: events queuing determine callback
* @callback: callback to register
*
* Register a @watch on the given path, using the given xenbus_watch structure
- * for storage, and the given @callback function as the callback. Return 0 on
- * success, or -errno on error. On success, the given @path will be saved as
- * @watch->node, and remains the caller's to free. On error, @watch->node will
- * be NULL, the device will switch to %XenbusStateClosing, and the error will
- * be saved in the store.
+ * for storage, @will_handle function as the callback to determine if each
+ * event need to be queued, and the given @callback function as the callback.
+ * On success, the given @path will be saved as @watch->node, and remains the
+ * caller's to free. On error, @watch->node will be NULL, the device will
+ * switch to %XenbusStateClosing, and the error will be saved in the store.
+ *
+ * Returns: %0 on success or -errno on error
*/
int xenbus_watch_path(struct xenbus_device *dev, const char *path,
struct xenbus_watch *watch,
@@ -156,16 +159,20 @@ EXPORT_SYMBOL_GPL(xenbus_watch_path);
* xenbus_watch_pathfmt - register a watch on a sprintf-formatted path
* @dev: xenbus device
* @watch: watch to register
+ * @will_handle: events queuing determine callback
* @callback: callback to register
* @pathfmt: format of path to watch
*
* Register a watch on the given @path, using the given xenbus_watch
- * structure for storage, and the given @callback function as the callback.
- * Return 0 on success, or -errno on error. On success, the watched path
- * (@path/@path2) will be saved as @watch->node, and becomes the caller's to
- * kfree(). On error, watch->node will be NULL, so the caller has nothing to
+ * structure for storage, @will_handle function as the callback to determine if
+ * each event need to be queued, and the given @callback function as the
+ * callback. On success, the watched path (@path/@path2) will be saved
+ * as @watch->node, and becomes the caller's to kfree().
+ * On error, watch->node will be NULL, so the caller has nothing to
* free, the device will switch to %XenbusStateClosing, and the error will be
* saved in the store.
+ *
+ * Returns: %0 on success or -errno on error
*/
int xenbus_watch_pathfmt(struct xenbus_device *dev,
struct xenbus_watch *watch,
@@ -255,13 +262,15 @@ abort:
}
/**
- * xenbus_switch_state
+ * xenbus_switch_state - save the new state of a driver
* @dev: xenbus device
* @state: new state
*
* Advertise in the store a change of the given driver to the given new_state.
- * Return 0 on success, or -errno on error. On error, the device will switch
- * to XenbusStateClosing, and the error will be saved in the store.
+ * On error, the device will switch to XenbusStateClosing, and the error
+ * will be saved in the store.
+ *
+ * Returns: %0 on success or -errno on error
*/
int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state state)
{
@@ -305,7 +314,7 @@ static void xenbus_va_dev_error(struct xenbus_device *dev, int err,
}
/**
- * xenbus_dev_error
+ * xenbus_dev_error - place an error message into the store
* @dev: xenbus device
* @err: error to report
* @fmt: error message format
@@ -324,7 +333,7 @@ void xenbus_dev_error(struct xenbus_device *dev, int err, const char *fmt, ...)
EXPORT_SYMBOL_GPL(xenbus_dev_error);
/**
- * xenbus_dev_fatal
+ * xenbus_dev_fatal - put an error messages into the store and then shutdown
* @dev: xenbus device
* @err: error to report
* @fmt: error message format
@@ -346,7 +355,7 @@ void xenbus_dev_fatal(struct xenbus_device *dev, int err, const char *fmt, ...)
}
EXPORT_SYMBOL_GPL(xenbus_dev_fatal);
-/**
+/*
* Equivalent to xenbus_dev_fatal(dev, err, fmt, args), but helps
* avoiding recursion within xenbus_switch_state.
*/
@@ -453,7 +462,7 @@ void xenbus_teardown_ring(void **vaddr, unsigned int nr_pages,
}
EXPORT_SYMBOL_GPL(xenbus_teardown_ring);
-/**
+/*
* Allocate an event channel for the given xenbus_device, assigning the newly
* created local port to *port. Return 0 on success, or -errno on error. On
* error, the device will switch to XenbusStateClosing, and the error will be
@@ -479,7 +488,7 @@ int xenbus_alloc_evtchn(struct xenbus_device *dev, evtchn_port_t *port)
EXPORT_SYMBOL_GPL(xenbus_alloc_evtchn);
-/**
+/*
* Free an existing event channel. Returns 0 on success or -errno on error.
*/
int xenbus_free_evtchn(struct xenbus_device *dev, evtchn_port_t port)
@@ -499,7 +508,7 @@ EXPORT_SYMBOL_GPL(xenbus_free_evtchn);
/**
- * xenbus_map_ring_valloc
+ * xenbus_map_ring_valloc - allocate & map pages of VA space
* @dev: xenbus device
* @gnt_refs: grant reference array
* @nr_grefs: number of grant references
@@ -507,10 +516,11 @@ EXPORT_SYMBOL_GPL(xenbus_free_evtchn);
*
* Map @nr_grefs pages of memory into this domain from another
* domain's grant table. xenbus_map_ring_valloc allocates @nr_grefs
- * pages of virtual address space, maps the pages to that address, and
- * sets *vaddr to that address. Returns 0 on success, and -errno on
- * error. If an error is returned, device will switch to
+ * pages of virtual address space, maps the pages to that address, and sets
+ * *vaddr to that address. If an error is returned, device will switch to
* XenbusStateClosing and the error message will be saved in XenStore.
+ *
+ * Returns: %0 on success or -errno on error
*/
int xenbus_map_ring_valloc(struct xenbus_device *dev, grant_ref_t *gnt_refs,
unsigned int nr_grefs, void **vaddr)
@@ -599,14 +609,15 @@ static int __xenbus_map_ring(struct xenbus_device *dev,
}
/**
- * xenbus_unmap_ring
+ * xenbus_unmap_ring - unmap memory from another domain
* @dev: xenbus device
* @handles: grant handle array
* @nr_handles: number of handles in the array
* @vaddrs: addresses to unmap
*
* Unmap memory in this domain that was imported from another domain.
- * Returns 0 on success and returns GNTST_* on error
+ *
+ * Returns: %0 on success or GNTST_* on error
* (see xen/include/interface/grant_table.h).
*/
static int xenbus_unmap_ring(struct xenbus_device *dev, grant_handle_t *handles,
@@ -712,7 +723,7 @@ static int xenbus_map_ring_hvm(struct xenbus_device *dev,
}
/**
- * xenbus_unmap_ring_vfree
+ * xenbus_unmap_ring_vfree - unmap a page of memory from another domain
* @dev: xenbus device
* @vaddr: addr to unmap
*
@@ -720,7 +731,8 @@ static int xenbus_map_ring_hvm(struct xenbus_device *dev,
* Unmap a page of memory in this domain that was imported from another domain.
* Use xenbus_unmap_ring_vfree if you mapped in your memory with
* xenbus_map_ring_valloc (it will free the virtual address space).
- * Returns 0 on success and returns GNTST_* on error
+ *
+ * Returns: %0 on success or GNTST_* on error
* (see xen/include/interface/grant_table.h).
*/
int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr)
@@ -916,10 +928,10 @@ static int xenbus_unmap_ring_hvm(struct xenbus_device *dev, void *vaddr)
}
/**
- * xenbus_read_driver_state
+ * xenbus_read_driver_state - read state from a store path
* @path: path for driver
*
- * Return the state of the driver rooted at the given store path, or
+ * Returns: the state of the driver rooted at the given store path, or
* XenbusStateUnknown if no state can be read.
*/
enum xenbus_state xenbus_read_driver_state(const char *path)