linux-kernel - Re: [PATCH 1/3] dmaengine: at_xdmac: align descriptors on 64 bits

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 13 May 2016 14:27:14 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Ludovic Desroches <ludovic.desroches@...el.com>,
	<vinod.koul@...el.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dmaengine: at_xdmac: align descriptors on 64 bits

Le 12/05/2016 16:54, Ludovic Desroches a écrit :
> Having descriptors aligned on 64 bits allows update CNDA and CUBC in an
> atomic way.
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
> Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel
> eXtended DMA Controller driver")
> Cc: stable@...r.kernel.org #v4.1 and later

Reviewed-by: Nicolas Ferre <nicolas.ferre@...el.com>

> ---
>  drivers/dma/at_xdmac.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
> index 8e304b1..ba9b0b7 100644
> --- a/drivers/dma/at_xdmac.c
> +++ b/drivers/dma/at_xdmac.c
> @@ -242,7 +242,7 @@ struct at_xdmac_lld {
>  	u32		mbr_dus;	/* Destination Microblock Stride Register */
>  };
>  
> -
> +/* 64-bit alignment needed to update CNDA and CUBC registers in an atomic way. */
>  struct at_xdmac_desc {
>  	struct at_xdmac_lld		lld;
>  	enum dma_transfer_direction	direction;
> @@ -253,7 +253,7 @@ struct at_xdmac_desc {
>  	unsigned int			xfer_size;
>  	struct list_head		descs_list;
>  	struct list_head		xfer_node;
> -};
> +} __aligned(sizeof(u64));
>  
>  static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)
>  {
> 


-- 
Nicolas Ferre