linux-kernel - Re: [PATCH v2 3/9] fsldma: use channel name in printk output

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Date:	Wed, 02 Mar 2011 15:17:36 -0800
From:	Joe Perches <joe@...ches.com>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	leoli@...escale.com, dan.j.williams@...el.com
Subject: Re: [PATCH v2 3/9] fsldma: use channel name in printk output

On Wed, 2011-03-02 at 14:23 -0800, Ira W. Snyder wrote:
> This makes debugging the driver much easier when multiple channels are
> running concurrently. In addition, you can see how much descriptor
> memory each channel has allocated via the dmapool API in sysfs.
> 
> Signed-off-by: Ira W. Snyder <iws@...o.caltech.edu>
> ---
>  drivers/dma/fsldma.c |   60 +++++++++++++++++++++++++++----------------------
>  drivers/dma/fsldma.h |    1 +
>  2 files changed, 34 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
> index 2e1af45..6e3d3d7 100644
> --- a/drivers/dma/fsldma.c
> +++ b/drivers/dma/fsldma.c
> @@ -37,7 +37,7 @@
>  
>  #include "fsldma.h"
>  
> -static const char msg_ld_oom[] = "No free memory for link descriptor\n";
> +static const char msg_ld_oom[] = "No free memory for link descriptor";
>  
>  /*
>   * Register Helpers
> @@ -207,7 +207,7 @@ static void dma_halt(struct fsldma_chan *chan)
>  	}
>  
>  	if (!dma_is_idle(chan))
> -		dev_err(chan->dev, "DMA halt timeout!\n");
> +		dev_err(chan->dev, "%s: DMA halt timeout!\n", chan->name);

I suggest instead you add:

#define chan_err(chan, fmt, arg...) 				\
	dev_err(chan->dev, "%s: " fmt, chan->name, ##arg);
#define chan_info(chan, fmt, arg...)				\
	dev_info(chan->dev, "%s: " fmt, chan->name, ##arg);
#define chan_dbg(chan, fmt, arg...)				\
	dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg);

and change the uses to be similar to:

	if (!dma_is_idle(chan))
		chan_err(chan, "DMA halt timeout!\n");

etc...


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