Merge "msm: mdss: Acquire mutex only when needed in overlay_set in mdp3"

/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.

/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

	stride = req->src.width * ppp_bpp(req->src.format);

	format = mdp3_ctrl_get_source_format(req->src.format);

	mutex_lock(&mdp3_session->lock);

	if (mdp3_session->overlay.id != req->id)

		pr_err("overlay was not released, continue to recover\n");

	mdp3_session->overlay = *req;

	/*

	 * A change in overlay structure will always come with

	 * MSMFB_NEW_REQUEST for MDP3

	*/

	if (req->id == MSMFB_NEW_REQUEST) {

		mutex_lock(&mdp3_session->lock);

		if (dma->source_config.stride != stride ||

				dma->source_config.format != format) {

			dma->source_config.format = format;

				mdp3_ctrl_get_pack_pattern(req->src.format);

			dma->update_src_cfg = true;

		}

		mdp3_session->overlay = *req;

		mdp3_session->overlay.id = 1;

		req->id = 1;

	}

		mutex_unlock(&mdp3_session->lock);

	}

	return rc;

}