On Fri, Jun 11, 2021 at 07:11:50PM +0200, David Hildenbrand wrote: > > Also, not convinced down_write_trylock() is appropriate from a sysfs > > callback, it should block and wait, surely? Otherwise userspace gets > > random racy failures depending on what the kernel is doing?? > > It might we worth exploring lock_device_hotplug_sysfs() which does a > > "return restart_syscall()" with some delay. The ideal design from a sysfs should be a single down_write_killable(). restart_syscall will just create a weird spinlock that is hopefully unlikely to spin :\ Jason
