On Tue, 30 Jun 2015, Oliver Neukum wrote: > Hi, > > I am looking at a device that spontaneously switches > its mode. I guess that you need to actively do something > that some Windows versions do to keep the device in its > initial mode. When does the spontaneous mode switch occur? > The device contains an SD card reader. That leaves me in > a predicament. The medium if it is mounted before the > device switches will be dirty. > > Normally we say that unmounting before you switch > is a responsibility of user space. But this device > switches by itself. > In that particular case I would go as far as make > the storage driver refuse the storage interface > of the initial mode. > > What do you think? I agree. If a storage device is going to disconnect itself at random times, we shouldn't try to access it. Users can override this behavior with usb-storage's "i" quirk flag if they need to. 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
