linux-kernel - Re: [PATCH 2/2] regmap: Support some more block operations on cached devices

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] [day] [month] [year] [list]

Date:	Wed, 9 Nov 2011 12:14:06 +0000
From:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] regmap: Support some more block operations on
	cached devices

On Tue, Nov 08, 2011 at 06:37:26PM +0100, Lars-Peter Clausen wrote:
> Commit 10a08d9f ("regmap: Support some block operations on cached devices")
> allowed raw read operations without throwing a warning when using caches if
> all registers are volatile. This patch does the same for raw write operations.
> 
> This is for example useful when loading a firmware in a predefined volatile
> region on a chip where we otherwise want registers to be cached.
> 
> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
> ---
>  drivers/base/regmap/regmap.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
> index 4016b00..a471083 100644
> --- a/drivers/base/regmap/regmap.c
> +++ b/drivers/base/regmap/regmap.c
> @@ -387,9 +387,11 @@ EXPORT_SYMBOL_GPL(regmap_write);
>  int regmap_raw_write(struct regmap *map, unsigned int reg,
>  		     const void *val, size_t val_len)
>  {
> +	size_t val_count = val_len / map->format.val_bytes;
>  	int ret;
>  
> -	WARN_ON(map->cache_type != REGCACHE_NONE);
> +	WARN_ON(!regmap_volatile_range(map, reg, val_count) &&
> +		map->cache_type != REGCACHE_NONE);
>  
>  	mutex_lock(&map->lock);
>  
> -- 
> 1.7.7

Acked-by: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/