On Mon, 29 Aug 2011, Andiry Xu wrote: > On Fri, 2011-08-26 at 11:20 -0400, Alan Stern wrote: > > uOn Fri, 26 Aug 2011, Andiry Xu wrote: > > > > > > What's wrong with running all the code above for a warm reset? > > > > > > > > > > The original warm reset code may reset a port with no connection and > > > > That's strange. What good does it do to reset a port with no > > connection? > > > > After double check the device's behavior, I found that I must do so. > When plug in the buggy device (Kingston DT Ultimate), it reports > CONNECTION, ENABLE, and link state as Recovery. Then when usbcore > fetches port status, it reports link state as SS.Inactive with no > CONNECTION and ENABLE. So driver has to warm reset the port even with no > connection. All right. Please add a comment to the code explaining that some buggy devices require a warm reset to be issued even when the port appears not to be connected. Alan Stern -- 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
