linux-kernel - Re: [PATCH v2] xhci: reduce xhci_handshake timeout in xhci

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Date:   Tue, 15 Feb 2022 10:43:32 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Jung Daehwan <dh10.jung@...sung.com>,
        Pavan Kondeti <quic_pkondeti@...cinc.com>
CC:     Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_ugoswami@...cinc.com
Subject: Re: [PATCH v2] xhci: reduce xhci_handshake timeout in xhci_reset


On 15.02.22 09:51, Jung Daehwan wrote:
>
> I also think it doesn't make sense 10 secs timeout with irqs disabled.
> It could cause critical system problem as Pavan said. How about adding
> new quirk for different timeout value?
>
Hi,

I am afraid this amounts to putting bandages onto a fundamental
flaw. We need a version of xhci_reset() that can sleep and if
you need interrupts to be off to reset the HC, you are doing a bad design.

    Regards
        Oliver