Re: [PATCH 1/2] net: ethernet: sxgbe: remove private tx queue lock

On Fri 2016-12-09 00:19:43, Francois Romieu wrote:

Lino Sanfilippo [off-list ref] :
[...]

quoted

OTOH Pavel said that he actually could produce a deadlock. Now I wonder if
this is caused by that locking scheme (in a way I have not figured out yet)
or if it is a different issue.

stmmac_tx_err races with stmmac_xmit.

Umm, yes, that looks real.

And that means that removing tx_lock will not be completely trivial
:-(. Lino, any ideas there?

netif_tx_lock_irqsave() would help, but afaict that one does not
exist.

Plus, does someone know how to trigger the status == tx_hard_error? I
tried powering down the switch, but that did not do it.

Thanks,								Pavel

-- 
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