linux-kernel - [PATCH 4.4 023/101] usb: xhci: fix return value of xhci_setup

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Message-Id: <20170110131523.517729763@linuxfoundation.org>
Date:   Tue, 10 Jan 2017 14:36:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH 4.4 023/101] usb: xhci: fix return value of xhci_setup_device()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lu Baolu <baolu.lu@...ux.intel.com>

commit 90797aee5d6902b49a453c97d83c326408aeb5a8 upstream.

xhci_setup_device() should return failure with correct error number
when xhci host has died, removed or halted.

During usb device enumeration, if usb host is not accessible (died,
removed or halted), the hc_driver->address_device() should return
a corresponding error code to usb core. But current xhci driver just
returns success. This misleads usb core to continue the enumeration
by reading the device descriptor, which will result in failure, and
users will get a misleading message like "device descriptor read/8,
error -110".

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/host/xhci.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3808,8 +3808,10 @@ static int xhci_setup_device(struct usb_

 	mutex_lock(&xhci->mutex);

-	if (xhci->xhc_state)	/* dying, removing or halted */
+	if (xhci->xhc_state) {	/* dying, removing or halted */
+		ret = -ESHUTDOWN;
 		goto out;
+	}

 	if (!udev->slot_id) {
 		xhci_dbg_trace(xhci, trace_xhci_dbg_address,