[RESEND PATCH 1/3] mtd:mtdblock: remove the needless mtdblks_lock

[Brian Norris]

On Wed, Dec 03, 2014 at 10:19:52AM +0800, Gu Zheng wrote:
> The global lock mtdblks_lock was used to protect the original mtdblks
> array to avoid race conditions. As the mtdblks array was already gone,
> but the mtdblks_lock is left, and it causes latency when open/release dev.
> So we need to remove it here.
> 
> Signed-off-by: Gu Zheng <guz.fnst at cn.fujitsu.com>

Pushed this first patch to l2-mtd.git. Thanks!

I'm kinda ambivalent about the next two. They don't seem like necessary
cleanups, really. With the third patch, I think it's actually pretty
important that the caller understand that it's using container_of(). I
could be convinced otherwise though...

Brian