patch "usb: core: hub: fix race condition about TRSMRCY of resume" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: core: hub: fix race condition about TRSMRCY of resume

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 975f94c7d6c306b833628baa9aec3f79db1eb3a1 Mon Sep 17 00:00:00 2001
From: Chunfeng Yun <[email protected]>
Date: Wed, 12 May 2021 10:07:38 +0800
Subject: usb: core: hub: fix race condition about TRSMRCY of resume

This may happen if the port becomes resume status exactly when usb_port_resume() gets port status, it still need provide a TRSMCRY time before access the device.

---
 drivers/usb/core/hub.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

index b2bc4b7c4289..fc7d6cdacf16 100644
@@ -3642,9 +3642,6 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 		 * sequence.
 		 */
 		status = hub_port_status(hub, port1, &portstatus, &portchange);
-
-		/* TRSMRCY = 10 msec */
-		msleep(10);
 	}
 
  SuspendCleared:

@@ -3659,6 +3656,9 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 				usb_clear_port_feature(hub->hdev, port1,
 						USB_PORT_FEAT_C_SUSPEND);
 		}
+
+		/* TRSMRCY = 10 msec */
+		msleep(10);
 	}
 
 	if (udev->persist_enabled)

2.31.1