This is a note to let you know that I've just added the patch titled
xhci: Set HCD flag to defer primary roothub registration
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xhci-set-hcd-flag-to-defer-primary-roothub-registration.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b7a4f9b5d0e4b6dd937678c546c0b322dd1a4054 Mon Sep 17 00:00:00 2001
From: Kishon Vijay Abraham I <kishon@xxxxxx>
Date: Tue, 10 May 2022 14:46:30 +0530
Subject: xhci: Set HCD flag to defer primary roothub registration
From: Kishon Vijay Abraham I <kishon@xxxxxx>
commit b7a4f9b5d0e4b6dd937678c546c0b322dd1a4054 upstream.
Set "HCD_FLAG_DEFER_RH_REGISTER" to hcd->flags in xhci_run() to defer
registering primary roothub in usb_add_hcd() if xhci has two roothubs.
This will make sure both primary roothub and secondary roothub will be
registered along with the second HCD.
This is required for cold plugged USB devices to be detected in certain
PCIe USB cards (like Inateck USB card connected to AM64 EVM or J7200 EVM).
This patch has been added and reverted earier as it triggered a race
in usb device enumeration.
That race is now fixed in 5.16-rc3, and in stable back to 5.4
commit 6cca13de26ee ("usb: hub: Fix locking issues with address0_mutex")
commit 6ae6dc22d2d1 ("usb: hub: Fix usb enumeration issue due to address0
race")
[minor rebase change, and commit message update -Mathias]
CC: stable@xxxxxxxxxxxxxxx # 5.4+
Suggested-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Tested-by: Chris Chiu <chris.chiu@xxxxxxxxxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Link: https://lore.kernel.org/r/20220510091630.16564-3-kishon@xxxxxx
Signed-off-by: Adrian Zaharia <Adrian.Zaharia@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -696,6 +696,8 @@ int xhci_run(struct usb_hcd *hcd)
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
"Finished xhci_run for USB2 roothub");
+ set_bit(HCD_FLAG_DEFER_RH_REGISTER, &hcd->flags);
+
xhci_dbc_init(xhci);
xhci_debugfs_init(xhci);
Patches currently in stable-queue which might be from kishon@xxxxxx are
queue-5.10/xhci-set-hcd-flag-to-defer-primary-roothub-registration.patch
