ieee1394: eth1394: handle tlabel exhaustion
When eth1394 was unable to acquire a transaction label, it just dropped outgoing packets without attempt to resend them later. The transmit queue is now halted if no tlabel is available to ->hard_start_xmit(). A workqueue job is then scheduled to catch the moment when ieee1394 recycled the next lot of tlabels. Fixes http://bugzilla.kernel.org/show_bug.cgi?id=8402Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>
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