linux-kernel - [PATCH] PM / USB: hcd_pci: Skip secondary root hub check for HCD

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Date:   Tue, 25 Jul 2017 01:04:01 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux USB <linux-usb@...r.kernel.org>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Felipe Balbi <balbi@...nel.org>
Subject: [PATCH] PM / USB: hcd_pci: Skip secondary root hub check for HCD_DEAD()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

If HCD_DEAD(hcd) is "true" in check_root_hub_suspended(), it is
rather pointless to check the secondary root hub, so return early
then.

This actually fixes occasional suspend failures on one of my test
machines.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/usb/core/hcd-pci.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-pm/drivers/usb/core/hcd-pci.c
===================================================================
--- linux-pm.orig/drivers/usb/core/hcd-pci.c
+++ linux-pm/drivers/usb/core/hcd-pci.c
@@ -427,6 +427,9 @@ static int check_root_hub_suspended(stru
 		dev_warn(dev, "Root hub is not suspended\n");
 		return -EBUSY;
 	}
+	if (HCD_DEAD(hcd))
+		return 0;
+
 	if (hcd->shared_hcd) {
 		hcd = hcd->shared_hcd;
 		if (HCD_RH_RUNNING(hcd)) {