From 863981e96738983919de841ec669e157e6bdaeb0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Sun, 11 Sep 2016 04:34:46 -0300
Subject: Linux-libre 4.7.1-gnu

---
 drivers/usb/core/message.c | 48 +++++++++++++++++++++-------------------------
 1 file changed, 22 insertions(+), 26 deletions(-)

(limited to 'drivers/usb/core/message.c')

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 8e641b589..ea681f157 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -302,9 +302,10 @@ static void sg_complete(struct urb *urb)
 		 */
 		spin_unlock(&io->lock);
 		for (i = 0, found = 0; i < io->entries; i++) {
-			if (!io->urbs[i] || !io->urbs[i]->dev)
+			if (!io->urbs[i])
 				continue;
 			if (found) {
+				usb_block_urb(io->urbs[i]);
 				retval = usb_unlink_urb(io->urbs[i]);
 				if (retval != -EINPROGRESS &&
 				    retval != -ENODEV &&
@@ -515,12 +516,10 @@ void usb_sg_wait(struct usb_sg_request *io)
 		int retval;
 
 		io->urbs[i]->dev = io->dev;
-		retval = usb_submit_urb(io->urbs[i], GFP_ATOMIC);
-
-		/* after we submit, let completions or cancellations fire;
-		 * we handshake using io->status.
-		 */
 		spin_unlock_irq(&io->lock);
+
+		retval = usb_submit_urb(io->urbs[i], GFP_NOIO);
+
 		switch (retval) {
 			/* maybe we retrying will recover */
 		case -ENXIO:	/* hc didn't queue this one */
@@ -578,31 +577,28 @@ EXPORT_SYMBOL_GPL(usb_sg_wait);
 void usb_sg_cancel(struct usb_sg_request *io)
 {
 	unsigned long flags;
+	int i, retval;
 
 	spin_lock_irqsave(&io->lock, flags);
+	if (io->status) {
+		spin_unlock_irqrestore(&io->lock, flags);
+		return;
+	}
+	/* shut everything down */
+	io->status = -ECONNRESET;
+	spin_unlock_irqrestore(&io->lock, flags);
 
-	/* shut everything down, if it didn't already */
-	if (!io->status) {
-		int i;
-
-		io->status = -ECONNRESET;
-		spin_unlock(&io->lock);
-		for (i = 0; i < io->entries; i++) {
-			int retval;
+	for (i = io->entries - 1; i >= 0; --i) {
+		usb_block_urb(io->urbs[i]);
 
-			if (!io->urbs[i]->dev)
-				continue;
-			retval = usb_unlink_urb(io->urbs[i]);
-			if (retval != -EINPROGRESS
-					&& retval != -ENODEV
-					&& retval != -EBUSY
-					&& retval != -EIDRM)
-				dev_warn(&io->dev->dev, "%s, unlink --> %d\n",
-					__func__, retval);
-		}
-		spin_lock(&io->lock);
+		retval = usb_unlink_urb(io->urbs[i]);
+		if (retval != -EINPROGRESS
+		    && retval != -ENODEV
+		    && retval != -EBUSY
+		    && retval != -EIDRM)
+			dev_warn(&io->dev->dev, "%s, unlink --> %d\n",
+				 __func__, retval);
 	}
-	spin_unlock_irqrestore(&io->lock, flags);
 }
 EXPORT_SYMBOL_GPL(usb_sg_cancel);
 
-- 
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