linux-kernel - Re: [PATCH 3/7] regmap: Add a mutex to guard the sync operation

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Date:	Wed, 28 Sep 2011 13:52:50 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH 3/7] regmap: Add a mutex to guard the sync operation

On Wed, Sep 28, 2011 at 11:43:43AM +0100, Dimitris Papastamos wrote:

> +	mutex_lock(&map->sync_lock);
>  	dev_dbg(map->dev, "Syncing %s cache\n",
>  		map->cache_ops->name);
>  	name = map->cache_ops->name;
> @@ -254,6 +257,7 @@ int regcache_sync(struct regmap *map)
>  	}
>  out:
>  	trace_regcache_sync(map->dev, name, "stop");
> +	mutex_unlock(&map->sync_lock);

Shouldn't we either be taking the regmap lock when doing the sync or
otherwise guarding against something other than a cache sync?
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