linux-kernel - [PATCH v2 1/2] usb: ehci-pci: Set PROBE_PREFER

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Message-Id: <20221028184507.v2.1.I9a5353f81d1509f85f3a04f0cdc9099f6fe60811@changeid>
Date:   Fri, 28 Oct 2022 18:45:34 -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 v2 1/2] usb: ehci-pci: Set PROBE_PREFER_ASYNCHRONOUS

This driver often takes on the order of 8ms to start, but every little
bit counts. 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>
Acked-by: Alan Stern <stern@...land.harvard.edu>
---

Changes in v2:
 - Add Alan's Ack

 drivers/usb/host/ehci-pci.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 17f8b6ea0c35..4b148fe5e43b 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -411,11 +411,12 @@ static struct pci_driver ehci_pci_driver = {
 	.remove =	ehci_pci_remove,
 	.shutdown = 	usb_hcd_pci_shutdown,
 
-#ifdef CONFIG_PM
 	.driver =	{
-		.pm =	&usb_hcd_pci_pm_ops
-	},
+#ifdef CONFIG_PM
+		.pm =	&usb_hcd_pci_pm_ops,
 #endif
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
 };
 
 static int __init ehci_pci_init(void)
-- 
2.38.1.273.g43a17bfeac-goog