linux-kernel - [PATCH 2/2] usb: xhci-pci: Set PROBE_PREFER

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Message-Id: <20221028141821.2.I5a309231785d3a4e37118a25e84f5caa0136a343@changeid>
Date:   Fri, 28 Oct 2022 14:19:08 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     Brian Norris <briannorris@...omium.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH 2/2] usb: xhci-pci: Set PROBE_PREFER_ASYNCHRONOUS

This driver often takes on the order of 10ms to start, but in some cases
takes more than 100ms. It shouldn't have many cross-device dependencies
to race with, nor racy access to shared state with other drivers, so
this should be a relatively low risk change.

This driver was pinpointed as part of a survey of top slowest initcalls
(i.e., are built in, and probing synchronously) on a lab of ChromeOS
systems.

Signed-off-by: Brian Norris <briannorris@...omium.org>
---

 drivers/usb/host/xhci-pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 40228a3d77a0..4da03de1be70 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -689,7 +689,8 @@ static struct pci_driver xhci_pci_driver = {
 	.shutdown = 	usb_hcd_pci_shutdown,
 #ifdef CONFIG_PM
 	.driver = {
-		.pm = &usb_hcd_pci_pm_ops
+		.pm = &usb_hcd_pci_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 #endif
 };
-- 
2.38.1.273.g43a17bfeac-goog