From: Hayes Wang <hayeswang@xxxxxxxxxxx> Date: Mon, 14 Nov 2016 07:23:51 +0000 > Mark Lord [mailto:mlord@xxxxxxxxx] >> 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(). This is why it's most likely some DMA implementation issue or similar. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
