Hello,
I think that the g_serial patch is still not integrated and it's still
needed at least as I experienced it on 3.4-rt17 on ARM:
http://www.spinics.net/lists/linux-rt-users/msg07158.html
Here is an update of the patch:
--- a/drivers/usb/gadget/u_serial.c 2012-08-29 12:17:48.607922510 -0700
+++ b/drivers/usb/gadget/u_serial.c 2012-08-29 12:23:21.305572267 -0700
@@ -554,7 +554,15 @@
* a workqueue, so we won't get callbacks and can hold port_lock
*/
if (tty && do_push)
- tty_flip_buffer_push(tty);
+ /*
+ * Drop the lock here since it might end up calling
+ * gs_flush_chars, which takes the lock.
+ */
+ spin_unlock_irq(&port->port_lock);
+ tty_flip_buffer_push(tty);
+ spin_lock_irq(&port->port_lock);
+ /* tty may have been closed */
+ tty = port->port_tty;
/* We want our data queue to become empty ASAP, keeping data
Grégoire
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