linux-kernel - RE: [PATCH v2] usb: xhci: Don't drive port 2.0 reset while resuming

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Date:   Wed, 26 Oct 2016 10:39:48 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Sriram Dash <sriram.dash@....com>
cc:     Mathias Nyman <mathias.nyman@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "mathias.nyman@...el.com" <mathias.nyman@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Suresh Gupta <suresh.gupta@....com>,
        "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
        Rajat Srivastava <rajat.srivastava@....com>,
        Rajesh Bhagat <rajesh.bhagat@....com>
Subject: RE: [PATCH v2] usb: xhci: Don't drive port 2.0 reset while resuming

On Wed, 26 Oct 2016, Sriram Dash wrote:

> >From: Mathias Nyman [mailto:mathias.nyman@...ux.intel.com]

> >I don't think usb core tries to drive reset while port is still resuming
> >
> 
> I am skeptical about it and hope somebody may help us on this.

You can see for yourself.  In drivers/usb/core/hub.c, the 
usb_reset_device() routine calls usb_autoresume_device() before calling 
usb_reset_and_verify_device().  Therefore the port will have finished
resuming before the reset signal is sent.

Alan Stern