On Mon, Dec 02, 2013 at 03:19:16AM +0900, takas...@ops.dti.ne.jp wrote: > if (tx_buf) > tx_fifo(p, tx_buf, words, fifo_shift); > + else if (rx_buf && p->info->rx_need_dummy_tx) > + tx_fifo(p, rx_buf, words, fifo_shift);
This is going to transmit the contents of the RX buffer. This means that if there's any data in there it'll get sent but the expected behaviour would be to send all zeros. It's possible some devices may misbehave if this were to happen. It would be better to allocate some zeros with kzalloc() and send that. Really we should have core support for this, it's not the only controller with such limitations.
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