On Mon, Jun 2, 2014 at 6:04 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > No, this is completely wrong. When the driver uses SuperSpeed support, > there are two hcds: the high speed one and the SuperSpeed one. They > are different structures and they both need to be initialized. > > It sounds like you have confused struct dummy (there's only one of > these) with struct dummy_hcd (there are two of these). I think that indeed I was completely wrong but I wasn't confused about the structures, but regarding some details of what is executed when, in which order and in which context. The reason was that when I simply removed the timer / list initialization from dummy_start_ss(), (because they belong to the shared struct dummy_hcd so they better only be initialized in one place) I got a hard lockup during testing, when I started dummy_hcd in superspeed mode and added a device. I think that now I understand why this happened, but I will read the relevant bits from dummy_hcd and xhci once more (especially what happens if there is a suspend / resume between the initialization of the highspeed hcd and the superspeed hcd) and come back with a different approach that will hopefully be both correct and DRY. Thanks a lot for the comments, they have been very helpful! Regards, Pantelis -- 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
