firewire: cdev: add closure to async stream ioctl

This changes the as yet unreleased FW_CDEV_IOC_SEND_STREAM_PACKET ioctl
to generate an fw_cdev_event_response event just like the other two
ioctls for asynchronous request transmission do.  This way, clients get
feedback on successful or unsuccessful transmission.

This also adds input validation for length, tag, channel, sy, speed.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 16 insertions, 15 deletions

diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 25bc827..c6b3ca3 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -606,28 +606,29 @@ struct fw_cdev_allocate_iso_resource {
 
 /**
  * struct fw_cdev_send_stream_packet - send an asynchronous stream packet
- * @generation:   Bus generation where the packet is valid
- * @speed:	  Speed code to send the packet at
- * @channel:	  Channel to send the packet on
- * @sy:		  Four-bit sy code for the packet
- * @tag:	  Two-bit tag field to use for the packet
- * @size:	  Size of the packet's data payload
- * @data:	  Userspace pointer to the payload
+ * @length:	Length of outgoing payload, in bytes
+ * @tag:	Data format tag
+ * @channel:	Isochronous channel to transmit to
+ * @sy:		Synchronization code
+ * @closure:	Passed back to userspace in the response event
+ * @data:	Userspace pointer to payload
+ * @generation:	The bus generation where packet is valid
+ * @speed:	Speed to transmit at
  *
  * The %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl sends an asynchronous stream packet
- * to every device (that is listening to the specified channel) on the
- * firewire bus.  It is the applications's job to ensure
- * that the intended device(s) will be able to receive the packet at the chosen
- * transmit speed.
+ * to every device which is listening to the specified channel.  The kernel
+ * writes an &fw_cdev_event_response event which indicates success or failure of
+ * the transmission.
  */
 struct fw_cdev_send_stream_packet {
-	__u32 generation;
-	__u32 speed;
+	__u32 length;
+	__u32 tag;
 	__u32 channel;
 	__u32 sy;
-	__u32 tag;
-	__u32 size;
+	__u64 closure;
 	__u64 data;
+	__u32 generation;
+	__u32 speed;
 };
 
 #endif /* _LINUX_FIREWIRE_CDEV_H */