[PATCH 4/6] usb: dwc3: take lock while modifying flags

[Paul Zimmerman <Paul.Zimmerman@xxxxxxxxxxxx>]

dwc3_gadget_ep_set_wedge() and dwc3_gadget_set_selfpowered() were
modifying dwc->flags/dwc->is_selfpowered without taking the lock.
Since those modifications are non-atomic, that could cause other
flags to be corrupted. Fix them both to take the lock.

Signed-off-by: Paul Zimmerman <paulz@xxxxxxxxxxxx>
---
 drivers/usb/dwc3/gadget.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 5a36f52..39d1c9c 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1141,8 +1141,12 @@ out:
 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
 {
 	struct dwc3_ep			*dep = to_dwc3_ep(ep);
+	struct dwc3			*dwc = dep->dwc;
+	unsigned long			flags;
 
+	spin_lock_irqsave(&dwc->lock, flags);
 	dep->flags |= DWC3_EP_WEDGE;
+	spin_unlock_irqrestore(&dwc->lock, flags);
 
 	return dwc3_gadget_ep_set_halt(ep, 1);
 }
@@ -1268,8 +1272,11 @@ static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
 		int is_selfpowered)
 {
 	struct dwc3		*dwc = gadget_to_dwc(g);
+	unsigned long		flags;
 
+	spin_lock_irqsave(&dwc->lock, flags);
 	dwc->is_selfpowered = !!is_selfpowered;
+	spin_unlock_irqrestore(&dwc->lock, flags);
 
 	return 0;
 }
-- 
1.7.4.4

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