openpower/linux/linux-0002-Revert-usb-xhci-stop-everything-on-the-first-call-to.patch

From 2481d9f7a822f3e5273c9bd4e273685eeb939b26 Mon Sep 17 00:00:00 2001
From: Joel Stanley <joel@jms.id.au>
Date: Thu, 28 Jan 2016 13:07:06 +1030
Subject: [PATCH 2/7] Revert "usb: xhci: stop everything on the first call to
 xhci_stop"

This reverts commit 8c24d6d7b09deee3036ddc4f2b81b53b28c8f877.

With this patch, the driver stops everything at the first call to
xhci_stop, which is always for the secondary HCD when executing the
.remove handler. We instead want to only stop when the primray HCD is
shutting down.

Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/usb/host/xhci.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index ec9e758d5fcd..0e66476d4866 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -666,6 +666,15 @@ int xhci_run(struct usb_hcd *hcd)
 }
 EXPORT_SYMBOL_GPL(xhci_run);
 
+static void xhci_only_stop_hcd(struct usb_hcd *hcd)
+{
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	spin_lock_irq(&xhci->lock);
+	xhci_halt(xhci);
+	spin_unlock_irq(&xhci->lock);
+}
+
 /*
  * Stop xHCI driver.
  *
@@ -680,14 +689,15 @@ void xhci_stop(struct usb_hcd *hcd)
 	u32 temp;
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 
-	if (xhci->xhc_state & XHCI_STATE_HALTED)
+	mutex_lock(&xhci->mutex);
+
+	if (!usb_hcd_is_primary_hcd(hcd)) {
+		xhci_only_stop_hcd(xhci->shared_hcd);
+		mutex_unlock(&xhci->mutex);
 		return;
+	}
 
-	mutex_lock(&xhci->mutex);
 	spin_lock_irq(&xhci->lock);
-	xhci->xhc_state |= XHCI_STATE_HALTED;
-	xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
-
 	/* Make sure the xHC is halted for a USB3 roothub
 	 * (xhci_stop() could be called as part of failed init).
 	 */
-- 
2.8.1