linux-kernel - Re: [PATCH] dma: rcar-dmac: use list_add() on rcar_dmac_desc

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Message-ID: <878tysbdar.wl%kuninori.morimoto.gx@renesas.com>
Date:	Mon, 30 May 2016 00:34:01 +0000
From:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	sakato <ryusuke.sakato.bx@...esas.com>,
	OSD2 ML <osd2@...renesas.com>, <dmaengine@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma: rcar-dmac: use list_add() on rcar_dmac_desc_put()


Hi Vinod

> > > > Current rcar_dmac_desc_put() is using list_add_tail() in order to
> > > > push used descriptor to list of free descriptors, and next DMA transfer
> > > > try to reuse it from this list. But because it is using *_tail(),
> > > > this reuse effect can't be obtained without using all of them.
> > > > For a longer-term solution, we should allocate hardware descriptors
> > > > using GFP_KERNEL instead of GFP_NOWAIT, but it is difficult today.
> > > > This patch uses list_add() instead of list_add_tail() for short-term
> > > > solution.
> > > 
> > > Applied, thanks
> > 
> > Thanks, but where did you apply it to ? I can't find it in your tree.
> 
> I changed my mind after this and felt that we should document above
> in the changelog as well and replied to Kuninori few moments after this [1]
> 
> Sorry if that wasn't clear that am not applying this.
> 
> Please resend it with update changelog
> 
> [1]: http://www.spinics.net/lists/dmaengine/msg09585.html

OK, will do

Best regards
---
Kuninori Morimoto