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    SubjectRe: [PATCH 4.4 026/143] usb: hub: delay hub autosuspend if USB3 port is still link training
    On Mon, 18 Feb 2019, Greg Kroah-Hartman wrote:

    > 4.4-stable review patch. If anyone has any objections, please let me know.
    >
    > ------------------
    >
    > [ Upstream commit e86108940e541febf35813402ff29fa6f4a9ac0b ]
    >
    > When initializing a hub we want to give a USB3 port in link training
    > the same debounce delay time before autosuspening the hub as already
    > trained, connected enabled ports.
    >
    > USB3 ports won't reach the enabled state with "current connect status" and
    > "connect status change" bits set until the USB3 link training finishes.
    >
    > Catching the port in link training (polling) and adding the debounce delay
    > prevents unnecessary failed attempts to autosuspend the hub.
    >
    > Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
    > Acked-by: Alan Stern <stern@rowland.harvard.edu>
    > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    > Signed-off-by: Sasha Levin <sashal@kernel.org>

    We should be careful with this commit; it has caused problems for some
    people. Mathias has been working to fix them, but this commit
    shouldn't go into -stable until the fixes are also ready to go.

    Alan Stern

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