Hi all, Rakesh reported a bug where a FLR can trivially crash his system. The reason for that is that NVMe unbinds the driver from the PCI device on an unrecoverable error, and that races with the reset_notify method. This is fairly easily fixable by taking the device lock for a slightly longer period. Note that the other PCI error handling methods actually have the same issue, but with them not taking the lock yet and me having no good way to reproducibly call them I'm a little reluctant to touch them, but it would be great if we could fix those issues as well. Patches 2 and 3 are cleanups in the same area and not 4.12 material, but given that they depend on the first one I thought I'd send them along. Changes since V1: - lock over all calls to ->reset_notify
