On Sat, 6 Mar 2010, Dmitry Torokhov wrote: > OK, the patch below unwedges vmware-usb-arbitrator that tries to access > /proc/bus/input/devices (it doers what input core does now), however > khubd is still wedged with the following lockdep output: I admit, I don't understand exactly what's going wrong here. Maybe you're experiencing the same bug that Oliver was trying to fix, in a slightly different form. The order of locking should always be: usbfs_mutex first, usb_notifier_list.rwsem second. I can't tell from the lockdep output how the reversal occurred. Regardless, it seems the best thing to do is take Linus's advice. Remove all uses of usbfs_mutex from devices.c and make conndiscevcnt an atomic_t so that it can be incremented without locking. And while you're at it, please also follow Linus's implied suggestion and change that stupid variable name. Generations of code readers to come will thank you. 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
