linux-kernel - [PATCH] USB :core :Prevent USB devices to autosuspend while setting interface

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Message-Id: <1510318190-25180-1-git-send-email-abhijeet.kumar@intel.com>
Date:   Fri, 10 Nov 2017 18:19:48 +0530
From:   Abhijeet@...r.kernel.org, Kumar@...r.kernel.org
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        abhijeet kumar <abhijeet.kumar@...el.com>,
        Jaejoong Kim <climbbb.kim@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] USB :core :Prevent USB devices to autosuspend while setting interface

From: abhijeet kumar <abhijeet.kumar@...el.com>

Runtime resume USB device in order to ensure that PM framework
knows that the we might be using the device in a short time and doesn't
autosuspend the device while we updating it's interface.

Signed-off-by: abhijeet kumar <abhijeet.kumar@...el.com>
---
 drivers/usb/core/message.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 371a07d874a3..658603ed779e 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1305,6 +1305,9 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
 	if (iface->unregistering)
 		return -ENODEV;
 
+	/*Letting runtime PM now that we wish to use the device in a short time
+	 *pm_runtime_get(&iface->dev);
+	 */
+
 	alt = usb_altnum_to_altsetting(iface, alternate);
 	if (!alt) {
 		dev_warn(&dev->dev, "selecting invalid altsetting %d\n",
-- 
1.9.1