linux-kernel - [14/85] usb: gadget: f_mass_storage: add missing memory barrier for thread_wakeup

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Message-ID: <lsq.1374674565.299006147@decadent.org.uk>
Date:	Wed, 24 Jul 2013 15:02:45 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Felipe Balbi" <balbi@...com>,
	"UCHINO Satoshi" <satoshi.uchino@...hiba.co.jp>,
	"Michal Nazarewicz" <mina86@...a86.com>
Subject: [14/85] usb: gadget: f_mass_storage: add missing memory barrier
 for thread_wakeup_needed

3.2.49-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: UCHINO Satoshi <satoshi.uchino@...hiba.co.jp>

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@...hiba.co.jp>
Acked-by: Michal Nazarewicz <mina86@...a86.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/gadget/f_mass_storage.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -512,6 +512,7 @@ static int fsg_set_halt(struct fsg_dev *
 /* Caller must hold fsg->lock */
 static void wakeup_thread(struct fsg_common *common)
 {
+	smp_wmb();	/* ensure the write of bh->state is complete */
 	/* Tell the main thread that something has happened */
 	common->thread_wakeup_needed = 1;
 	if (common->thread_task)
@@ -731,6 +732,7 @@ static int sleep_thread(struct fsg_commo
 	}
 	__set_current_state(TASK_RUNNING);
 	common->thread_wakeup_needed = 0;
+	smp_rmb();	/* ensure the latest bh->state is visible */
 	return rc;
 }
 

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