patches.renesas/0179-usb-xhci-Add-helper-function-xhci_disable_slot.patch

From 77e05bb8ebc2487f8bd850acb5e383265364ca95 Mon Sep 17 00:00:00 2001
From: Guoqing Zhang <guoqing.zhang@intel.com>
Date: Fri, 7 Apr 2017 17:56:52 +0300
Subject: [PATCH 179/286] usb: xhci: Add helper function xhci_disable_slot().

Refactoring slot disable related code into a helper
function xhci_disable_slot() which can be used when
enabling test mode.

Signed-off-by: Guoqing Zhang <guoqing.zhang@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit f9e609b82479ef48469d42b022b0951abc00dcd1)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/usb/host/xhci.c |   49 ++++++++++++++++++++++++++++++------------------
 drivers/usb/host/xhci.h |    2 +
 2 files changed, 33 insertions(+), 18 deletions(-)

--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3564,8 +3564,6 @@ void xhci_free_dev(struct usb_hcd *hcd,
 {
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 	struct xhci_virt_device *virt_dev;
-	unsigned long flags;
-	u32 state;
 	int i, ret;
 	struct xhci_command *command;
 
@@ -3600,30 +3598,50 @@ void xhci_free_dev(struct usb_hcd *hcd,
 		del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
 	}
 
+	xhci_disable_slot(xhci, command, udev->slot_id);
+	/*
+	 * Event command completion handler will free any data structures
+	 * associated with the slot.  XXX Can free sleep?
+	 */
+}
+
+int xhci_disable_slot(struct xhci_hcd *xhci, struct xhci_command *command,
+			u32 slot_id)
+{
+	unsigned long flags;
+	u32 state;
+	int ret = 0;
+	struct xhci_virt_device *virt_dev;
+
+	virt_dev = xhci->devs[slot_id];
+	if (!virt_dev)
+		return -EINVAL;
+	if (!command)
+		command = xhci_alloc_command(xhci, false, false, GFP_KERNEL);
+	if (!command)
+		return -ENOMEM;
+
 	spin_lock_irqsave(&xhci->lock, flags);
 	/* Don't disable the slot if the host controller is dead. */
 	state = readl(&xhci->op_regs->status);
 	if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) ||
 			(xhci->xhc_state & XHCI_STATE_HALTED)) {
-		xhci_free_virt_device(xhci, udev->slot_id);
+		xhci_free_virt_device(xhci, slot_id);
 		spin_unlock_irqrestore(&xhci->lock, flags);
 		kfree(command);
-		return;
+		return ret;
 	}
 
-	if (xhci_queue_slot_control(xhci, command, TRB_DISABLE_SLOT,
-				    udev->slot_id)) {
+	ret = xhci_queue_slot_control(xhci, command, TRB_DISABLE_SLOT,
+				slot_id);
+	if (ret) {
 		spin_unlock_irqrestore(&xhci->lock, flags);
 		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
-		return;
+		return ret;
 	}
 	xhci_ring_cmd_db(xhci);
 	spin_unlock_irqrestore(&xhci->lock, flags);
-
-	/*
-	 * Event command completion handler will free any data structures
-	 * associated with the slot.  XXX Can free sleep?
-	 */
+	return ret;
 }
 
 /*
@@ -3730,15 +3748,10 @@ int xhci_alloc_dev(struct usb_hcd *hcd,
 
 disable_slot:
 	/* Disable slot, if we can do it without mem alloc */
-	spin_lock_irqsave(&xhci->lock, flags);
 	kfree(command->completion);
 	command->completion = NULL;
 	command->status = 0;
-	if (!xhci_queue_slot_control(xhci, command, TRB_DISABLE_SLOT,
-				     udev->slot_id))
-		xhci_ring_cmd_db(xhci);
-	spin_unlock_irqrestore(&xhci->lock, flags);
-	return 0;
+	return xhci_disable_slot(xhci, command, udev->slot_id);
 }
 
 /*
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -2021,6 +2021,8 @@ void xhci_shutdown(struct usb_hcd *hcd);
 int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks);
 void xhci_init_driver(struct hc_driver *drv,
 		      const struct xhci_driver_overrides *over);
+int xhci_disable_slot(struct xhci_hcd *xhci,
+			struct xhci_command *command, u32 slot_id);
 
 #ifdef	CONFIG_PM
 int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup);