From d68c277b501889b3a50c179d1c3d704db7947b83 Mon Sep 17 00:00:00 2001
From: UCHINO Satoshi <satoshi.uchino@toshiba.co.jp>
Date: Thu, 23 May 2013 11:10:11 +0900
Subject: [PATCH] usb: gadget: f_mass_storage: add missing memory barrier for
 thread_wakeup_needed

Without this memory barrier, the file-storage thread may fail to
escape from the following while loop, because it may observe new
common->thread_wakeup_needed and old bh->state which are updated by
the callback functions.

	/* Wait for the CBW to arrive */
	while (bh->state != BUF_STATE_FULL) {
		rc = sleep_thread(common);
		if (rc)
			return rc;
	}

Cc: stable@vger.kernel.org
Signed-off-by: UCHINO Satoshi <satoshi.uchino@toshiba.co.jp>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
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