On Wed, Sep 10, 2014 at 07:22:59PM +0800, Robin Gong wrote: > On Wed, Sep 10, 2014 at 11:21:05AM +0100, Mark Brown wrote: > > This isn't going to work, anything that looks at the usedma flag will > > see the result of the last thing that was checked which may or may not > > be the transfer that it's handling. The driver should check to see if > > the core mapped the transfer for DMA. > Yes, you're right. I should use "transfer->tx_sg->sgl == NULL" or > "transfer->rx_sg->sgl == NULL" instead of usedma flag in driver, right? Right.
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