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-rw-r--r--include/linux/firewire-cdev.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 0f0e271f97fa..4d078e99c017 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -154,8 +154,13 @@ struct fw_cdev_event_iso_interrupt {
* @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST
* @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
*
- * Convenience union for userspace use. Events could be read(2) into a char
- * buffer and then cast to this union for further processing.
+ * Convenience union for userspace use. Events could be read(2) into an
+ * appropriately aligned char buffer and then cast to this union for further
+ * processing. Note that for a request, response or iso_interrupt event,
+ * the data[] or header[] may make the size of the full event larger than
+ * sizeof(union fw_cdev_event). Also note that if you attempt to read(2)
+ * an event into a buffer that is not large enough for it, the data that does
+ * not fit will be discarded so that the next read(2) will return a new event.
*/
union fw_cdev_event {
struct fw_cdev_event_common common;
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