linux-kernel - RE: [PATCH net 2/2] r8152: rx descriptor check

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Message-ID: <0835B3720019904CB8F7AA43166CEEB20104EBCC@RTITMBSV03.realtek.com.tw>
Date:   Mon, 14 Nov 2016 07:23:51 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Mark Lord <mlord@...ox.com>, David Miller <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net 2/2] r8152: rx descriptor check

Mark Lord [mailto:mlord@...ox.com]
> Sent: Monday, November 14, 2016 4:34 AM
[...]
> Perhaps the driver
> is somehow accessing the buffer space again after doing usb_submit_urb()?
> That would certainly produce this kind of behaviour.

I don't think so. First, the driver only read the received buffer.
That is, the driver would not change (or write) the data. Second,
The driver would lose the point address of the received buffer
after submitting the urb to the USB host controller, until the
transfer is completed by the USB host controller. That is, the
driver doesn't how to access the buffer after calling usb_submit_urb().

Best Regards,
Hayes