linux-kernel - Re: [PATCH] dmaengine: at_hdmac: fix dma_addr

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Date:	Tue, 8 Dec 2015 21:48:38 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"Dmitry V. Krivenok" <krivenok.dmitry@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org
Subject: Re: [PATCH] dmaengine: at_hdmac: fix dma_addr_t printing

On Tue, Dec 08, 2015 at 04:34:28PM +0100, Arnd Bergmann wrote:
> A recent patch tried to improve the printk output of the atc_dump_lli()
> function but introduced a bug, in which we end up dereferencing a
> dma address as a pointer, and we even get a warning for it:
> 
> drivers/dma/at_hdmac_regs.h: In function 'atc_dump_lli':
> drivers/dma/at_hdmac_regs.h:388:4: warning: format '%p' expects argument of type 'void *', but argument 3 has type 'dma_addr_t {aka long long unsigned int}' [-Wformat=]
> 
> This changes the code to pass the DMA address by reference, as expected
> by printk.

Thanks for this but i was planning to drop 096117032a36 "dmaengine: do not
use 0x in front of %pad" as recomended by Dmitry, so we should fix this
cleanly

I will push out updated tree in a short while...

> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 096117032a36 ("dmaengine: do not use 0x in front of %pad")
> ---
>  drivers/dma/at_hdmac_regs.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h
> index 610907dbc11a..0474e4a0f02a 100644
> --- a/drivers/dma/at_hdmac_regs.h
> +++ b/drivers/dma/at_hdmac_regs.h
> @@ -386,8 +386,8 @@ static void atc_dump_lli(struct at_dma_chan *atchan, struct at_lli *lli)
>  {
>  	dev_crit(chan2dev(&atchan->chan_common),
>  		 "  desc: s%pad d%pad ctrl0x%x:0x%x l%pad\n",
> -		 lli->saddr, lli->daddr,
> -		 lli->ctrla, lli->ctrlb, lli->dscr);
> +		 &lli->saddr, &lli->daddr,
> +		 lli->ctrla, lli->ctrlb, &lli->dscr);
>  }
>  
>  
> -- 
> 2.1.0.rc2
> 
> 

-- 
~Vinod
--
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