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From: Greg KH <>
To: Adrian Zaharia <>
Subject: Re: [PATCH 5.10 1/1] xhci: Set HCD flag to defer primary roothub registration
Date: Fri, 27 Jan 2023 08:25:16 +0100	[thread overview]
Message-ID: <Y9N8XEh6rL/> (raw)
In-Reply-To: <>

On Wed, Jan 25, 2023 at 03:33:59PM +0200, Adrian Zaharia wrote:
> From: Kishon Vijay Abraham I <>
> [ Upstream commit b7a4f9b5d0e4b6dd937678c546c0b322dd1a4054 ]
> 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: # 5.4+
> Suggested-by: Mathias Nyman <>
> Tested-by: Chris Chiu <>
> Signed-off-by: Kishon Vijay Abraham I <>
> Link:
> Signed-off-by: Adrian Zaharia <>
> ---
>  drivers/usb/host/xhci.c | 2 ++
>  1 file changed, 2 insertions(+)

You dropped my original signed-off-by?  Odd...

Anyway, now queued up.

greg k-h

      reply	other threads:[~2023-01-27  7:25 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-25 13:33 [PATCH 5.10 0/1] backport of 'xhci: Set HCD flag to defer primary roothub registration' Adrian Zaharia
2023-01-25 13:33 ` [PATCH 5.10 1/1] xhci: Set HCD flag to defer primary roothub registration Adrian Zaharia
2023-01-27  7:25   ` Greg KH [this message]

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