releases/3.10.13/usb-dwc3-gadget-don-t-request-irqs-in-atomic.patch

From b0d7ffd44ba9cd2dfbf299674418193a5f9ed21a Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi@ti.com>
Date: Thu, 27 Jun 2013 10:00:18 +0300
Subject: usb: dwc3: gadget: don't request IRQs in atomic

From: Felipe Balbi <balbi@ti.com>

commit b0d7ffd44ba9cd2dfbf299674418193a5f9ed21a upstream.

We cannot request an IRQ with spinlocks held
as that would trigger a sleeping inside
spinlock warning.

Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/dwc3/gadget.c |   39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1508,6 +1508,15 @@ static int dwc3_gadget_start(struct usb_
 	int			irq;
 	u32			reg;
 
+	irq = platform_get_irq(to_platform_device(dwc->dev), 0);
+	ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
+			IRQF_SHARED | IRQF_ONESHOT, "dwc3", dwc);
+	if (ret) {
+		dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
+				irq, ret);
+		goto err0;
+	}
+
 	spin_lock_irqsave(&dwc->lock, flags);
 
 	if (dwc->gadget_driver) {
@@ -1515,7 +1524,7 @@ static int dwc3_gadget_start(struct usb_
 				dwc->gadget.name,
 				dwc->gadget_driver->driver.name);
 		ret = -EBUSY;
-		goto err0;
+		goto err1;
 	}
 
 	dwc->gadget_driver	= driver;
@@ -1551,42 +1560,38 @@ static int dwc3_gadget_start(struct usb_
 	ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
 	if (ret) {
 		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
-		goto err0;
+		goto err2;
 	}
 
 	dep = dwc->eps[1];
 	ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
 	if (ret) {
 		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
-		goto err1;
+		goto err3;
 	}
 
 	/* begin to receive SETUP packets */
 	dwc->ep0state = EP0_SETUP_PHASE;
 	dwc3_ep0_out_start(dwc);
 
-	irq = platform_get_irq(to_platform_device(dwc->dev), 0);
-	ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
-			IRQF_SHARED | IRQF_ONESHOT, "dwc3", dwc);
-	if (ret) {
-		dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
-				irq, ret);
-		goto err1;
-	}
-
 	dwc3_gadget_enable_irq(dwc);
 
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
 	return 0;
 
-err1:
+err3:
 	__dwc3_gadget_ep_disable(dwc->eps[0]);
 
-err0:
+err2:
 	dwc->gadget_driver = NULL;
+
+err1:
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
+	free_irq(irq, dwc);
+
+err0:
 	return ret;
 }
 
@@ -1600,9 +1605,6 @@ static int dwc3_gadget_stop(struct usb_g
 	spin_lock_irqsave(&dwc->lock, flags);
 
 	dwc3_gadget_disable_irq(dwc);
-	irq = platform_get_irq(to_platform_device(dwc->dev), 0);
-	free_irq(irq, dwc);
-
 	__dwc3_gadget_ep_disable(dwc->eps[0]);
 	__dwc3_gadget_ep_disable(dwc->eps[1]);
 
@@ -1610,6 +1612,9 @@ static int dwc3_gadget_stop(struct usb_g
 
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
+	irq = platform_get_irq(to_platform_device(dwc->dev), 0);
+	free_irq(irq, dwc);
+
 	return 0;
 }