It appears that the problem is in rpmsg_pru.c.
rpmsg_pru_read has the following code:
if (kfifo_is_empty(&prudev->msg_fifo) &&
(filp->f_flags & O_NONBLOCK))
return -EAGAIN;
rpmsg_pru_write presumably needs a similar piece of code with
kfifo_is_full() or it needs to look for O_NONBLOCK and then use
rpmsg_trysend instead of rpmsg_send.
Unfortunately, I've got nowhere near the Linux kernel programming chops to
debate the implications of that.
Presumably, I need to file a bug somewhere?
Thanks.
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