Re: [PATCH v2] net: arc/emac: Move arc_emac_tx_clean() into arc_emac_tx() and disable tx interrut

From: Caesar Wang <redacted>
Date: Fri,  6 May 2016 20:19:16 +0800

Doing tx_clean() inside poll() may scramble the tx ring buffer if
tx() is running. This will cause tx to stop working, which can be
reproduced by simultaneously downloading two large files at high speed.

Moving tx_clean() into tx() will prevent this. And tx interrupt is no
longer needed now.

TX completion work is always recommended to be done in the ->poll()
handler.

Fix the race or whatever bug there is rather than working around it,
and regressing the driver, by handling TX completion in the interrupt
handler.

Thanks.