linux-kernel - Re: [PATCH 03/18] dmaengine: st_fdma: Add STMicroelectronics FDMA engine driver support

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Message-ID: <20160502093015.GD2274@localhost>
Date:	Mon, 2 May 2016 15:00:15 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Peter Griffin <peter.griffin@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	srinivas.kandagatla@...il.com, maxime.coquelin@...com,
	patrice.chotard@...com, lee.jones@...aro.org,
	dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
	arnd@...db.de, broonie@...nel.org, ludovic.barre@...com
Subject: Re: [PATCH 03/18] dmaengine: st_fdma: Add STMicroelectronics FDMA
 engine driver support

On Wed, Apr 27, 2016 at 01:59:23PM +0100, Peter Griffin wrote:
> > bunch of this seems similar to cyclic case, can you create common setup
> > routine for these, anyway cyclic is a special cases of slave_sg
> 
> In v4 I've made a st_fdma_prep_common() which abstracts out all the common
> checks at the beginning of the *_prep*() functions.
> 
> In v3 fill_fw_node() is already (from one of your previous reviews)
> abstracting out all the common parts from these loops. So everything
> that is now left is actually differences between the two setups.
> 
> Is that Ok?

Sounds better

> > and you irq is still enabled and tasklets can be scheduled!!
> > 
> Eeek! Very good point. Also looking at some other drivers we
> should be doing a of_dma_controller_free() and
> dma_async_device_unregister().
> 
> So something like this: -
> 
>   st_fdma_disable(); /*disables irqs*/
>   of_dma_controller_free(pdev->dev.of_node);
>   dma_async_device_unregister(&priv->slave);
>   st_fdma_clk_disable(fdev);

you can call devm_free_irq() explictyly, that will syncronize irq and
free it up. Also you should kill the tasklet afterwards.

-- 
~Vinod