On Tue, 27 Jan 2009, Saito.Koichiro wrote: > I think that it is difficult to put out a well-grounded > numerical value even if I thinks any further. If we usually > use it, I guess that low probability of unplugging a device > while accessing to a device. Because it is thought that CPU > is not completely occupied only with retrying, I think that > no problem. I want to finish the modification by the > retrying of 32 times. I changed to 32 from 255. > How do you think? It's probably okay. In the end we might decrease it even more, but for now we can leave it at 32. > >You did not understand my question. What happens if ehci_hcd is > >_loaded_ and the device is running at full speed or low speed because > >it is a USB-1.1 device plugged into a high-speed hub? > > I tested following case. > === case1 === > root hub : plugged "USB flash" and "high-speed hub" > high-speed hub : plugged "USB mouse" > === case2 === > root hub : plugged "high-speed hub" > high-speed hub : plugged "USB flash" and "USB mouse" > > USB mouse unplugged while accessing USB flash. In both > cases, XactErr didn't occurred. Though it doesn't relate to > the question, when two high-speed device plugged into > high-speed hub, error didn't occur. But what happens in case 1 when you unplug the flash drive while using the mouse? Here's a better test: case 3: root hub : high-speed hub and flash drive A high-speed hub : full-speed (USB 1.1) hub full-speed hub : flash drive B What happens if you unplug flash drive A while using flash drive B? 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
