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From: Vinod Koul <vkoul@kernel.org>
To: Tudor.Ambarus@microchip.com
Cc: Ludovic.Desroches@microchip.com, richard.genoud@gmail.com,
	gregkh@linuxfoundation.org, jirislaby@kernel.org,
	Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com,
	mripard@kernel.org, linux-arm-kernel@lists.infradead.org,
	dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-serial@vger.kernel.org
Subject: Re: [PATCH v2 08/13] dmaengine: at_xdmac: Move the free desc to the tail of the desc list
Date: Mon, 13 Dec 2021 14:30:55 +0530	[thread overview]
Message-ID: <YbcLx0wGFvFnvSXY@matsya> (raw)
In-Reply-To: <YbcLjrMF0YrCVgjc@matsya>

On 13-12-21, 14:29, Vinod Koul wrote:
> On 13-12-21, 08:51, Tudor.Ambarus@microchip.com wrote:
> > Hi, Vinod,
> > 
> > On 12/13/21 10:07 AM, Vinod Koul wrote:
> > > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > > 
> > > On 25-11-21, 11:00, Tudor Ambarus wrote:
> > >> So that we don't use the same desc over and over again.
> > > 
> > > Please use full para in the changelog and not a continuation of the
> > > patch title!
> > 
> > Ok, will add a better commit description. Here and in other patches where
> > your comment applies.
> 
> Great!
> 
> > > 
> > > and why is wrong with using same desc over and over? Any benefits of not
> > > doing so?
> > 
> > Not wrong, but if we move the free desc to the tail of the list, then the
> > sequence of descriptors is more track-able in case of debug. You would
> > know which descriptor should come next and you could easier catch
> > concurrency over descriptors for example. I saw virt-dma uses
> > list_splice_tail_init() as well, I found it a good idea, so I thought to
> > follow the core driver.
> 
> Okay, I would be good to add this motivation in the change log. I am
> sure after few you would also wonder why you did this change :)

Also, pls submit serial patches to Greg separately. I guess he saw the
title and overlooked those...

-- 
~Vinod

  reply	other threads:[~2021-12-13  9:01 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-25  9:00 [PATCH v2 00/13] dmaengine: at_xdmac: Various fixes Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 01/13] dmaengine: at_xdmac: Don't start transactions at tx_submit level Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 02/13] tty: serial: atmel: Check return code of dmaengine_submit() Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 03/13] tty: serial: atmel: Call dma_async_issue_pending() Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 04/13] dmaengine: at_xdmac: Start transfer for cyclic channels in issue_pending Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 05/13] dmaengine: at_xdmac: Print debug message after realeasing the lock Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 06/13] dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 07/13] dmaengine: at_xdmac: Fix race for the tx desc callback Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 08/13] dmaengine: at_xdmac: Move the free desc to the tail of the desc list Tudor Ambarus
2021-12-13  8:07   ` Vinod Koul
2021-12-13  8:51     ` Tudor.Ambarus
2021-12-13  8:59       ` Vinod Koul
2021-12-13  9:00         ` Vinod Koul [this message]
2021-12-13  9:22           ` Tudor.Ambarus
2021-12-13  9:27             ` Tudor.Ambarus
2021-11-25  9:00 ` [PATCH v2 09/13] dmaengine: at_xdmac: Fix concurrency over xfers_list Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 10/13] dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_advance_work() Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 11/13] dmaengine: at_xdmac: Fix lld view setting Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 12/13] dmaengine: at_xdmac: Fix at_xdmac_lld struct definition Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 13/13] dmaengine: at_xdmac: Fix race over irq_status Tudor Ambarus

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