From: Oliver Neukum <oliver@neukum.org>
Date: Sun, 26 Aug 2012 19:34:19 +0000 (+0200)
Subject: usb: dwc3: core: memory ordering fix in close
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=2a540edf7bb02f3e968d1ce7cb355e740ba7de13;p=openwrt%2Fstaging%2Fblogic.git

usb: dwc3: core: memory ordering fix in close

As a bitmap is used for free/used. As a device freed
all memory operations must be scheduled before the bitmap
is manipulated.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 4f2ef5345392..08a5738a6e1b 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -99,6 +99,7 @@ void dwc3_put_device_id(int id)
 
 	ret = test_bit(id, dwc3_devs);
 	WARN(!ret, "dwc3: ID %d not in use\n", id);
+	smp_mb__before_clear_bit();
 	clear_bit(id, dwc3_devs);
 }
 EXPORT_SYMBOL_GPL(dwc3_put_device_id);