linux-kernel - Re: [PATCH v3 08/12] dma: edma: Add one more required slot to MAX slots

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Message-ID: <52087921.8040101@ti.com>
Date:	Mon, 12 Aug 2013 11:26:49 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Joel Fernandes <joelf@...com>
CC:	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Sricharan R <r.sricharan@...com>,
	Rajendra Nayak <rnayak@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	Mark Brown <broonie@...aro.org>,
	Benoit Cousson <benoit.cousson@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Balaji TK <balajitk@...com>,
	Gururaja Hebbar <gururaja.hebbar@...com>,
	Chris Ball <cjb@...top.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
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Subject: Re: [PATCH v3 08/12] dma: edma: Add one more required slot to MAX
 slots

On Monday 05 August 2013 09:44 PM, Joel Fernandes wrote:
> We'd now need a separate slot just for the channel and separate
> ones for the 2 linked sets, so we make adjustments to allocate
> an extra channel accordingly.
> 
> Signed-off-by: Joel Fernandes <joelf@...com>

No need for a separate patch for this, just do this in the patch where
you include the two linked sets.

> ---
>  drivers/dma/edma.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
> index a242269..df50a04 100644
> --- a/drivers/dma/edma.c
> +++ b/drivers/dma/edma.c
> @@ -48,7 +48,7 @@
>  
>  /* Max of 16 segments per channel to conserve PaRAM slots */
>  #define MAX_NR_SG		16
> -#define EDMA_MAX_SLOTS		MAX_NR_SG
> +#define EDMA_MAX_SLOTS		(MAX_NR_SG+1)
>  #define EDMA_DESCRIPTORS	16
>  
>  struct edma_desc {
> @@ -311,6 +311,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
>  
>  	num_slots_needed = sg_len > MAX_NR_SG ? MAX_NR_SG : sg_len;
>  
> +	/* Allocate one extra to account for the channel itself */
> +	num_slots_needed++;

You can do:

	nslots = min(MAX_NR_SG, sg_len) + 1;

Thanks,
Sekhar

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