From: UCHINO Satoshi <satoshi.uchino@toshiba.co.jp>
Date: Thu, 23 May 2013 02:10:11 +0000 (+0900)
Subject: usb: gadget: f_mass_storage: add missing memory barrier for thread_wakeup_needed
X-Git-Tag: v3.2.49~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c818402a62e9b82e5c8552479a2c56bb8cdca3d9;p=pandora-kernel.git

usb: gadget: f_mass_storage: add missing memory barrier for thread_wakeup_needed

commit d68c277b501889b3a50c179d1c3d704db7947b83 upstream.

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;
	}

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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