linux-kernel - Re: [RESEND PATCH v2 1/4] usb: dbc: early driver for xhci debug capability

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Date:   Thu, 20 Oct 2016 11:08:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, linux-usb@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v2 1/4] usb: dbc: early driver for xhci debug
 capability

On Thu, Oct 20, 2016 at 10:41:32AM +0200, Peter Zijlstra wrote:
> I'm already only using early_printk() because regular printk() is an
> unfixable piece of crap, and now you're making early_printk() useless
> too.

Note that the existing USB debug port stuff doesn't seem to have a
single lock in. Its just polling on readl and doing writel without any
serialization what so ever.

Not that I've ever actually used it (lack of the magic cable), but it at
least looks like it should mostly work.