Hello,

On Wed, Jul 05, 2017 at 03:07:01PM +0200, Romain Perier wrote:

From: Nandor Han <redacted>

Avoid the situation when `dma_is_rxing` could incorrectly signal that
DMA RX channel is receiving data in case DMA preparation or sg mapping
fails.

This commit fixes the issues by moving the assignment of dma_is_rxing
out of imx_disable_rx_int(), then the variable is set to 1 from
start_rx_dma() only when the preparation is correctly done.

I'd write:

	There are a few issues with setting dma_is_rxing to 1 in
	imx_disable_rx_int:

	 - Currently always after imx_disable_rx_int() the function
	   start_rx_dma() is called. This dependency isn't obvious though.
	 - start_rx_dma() does error checking and might exit without enabling
	   DMA but keeping dma_is_rxing 1.

	So the more natural place for setting dma_is_rxing to 1 is in
	start_rx_dma after all errors are checked.

If you use this, there is nothing left of Nandor Han's patch and you can
drop his authorship.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |