On Fri, 2018-08-10 at 11:56 -0700, Tadeusz Struk wrote: > On 08/10/2018 11:48 AM, James Bottomley wrote: > > On Fri, 2018-08-10 at 11:21 -0700, Tadeusz Struk wrote: > > > and the feedback I got from Jason was: > > > > > > "I wonder if it is worth creating this when the first file is > > > opened.. Lots of systems have TPMs but few use the userspace.." > > > > > > so I changed this to allocate the WQ on first open. I think it > > > makes sense, but I leave it to you to decide. > > > > If the reason is to not create a wq unless it's needed, shouldn't > > the condition actually be first open with flag O_NONBLOCK? > > > > Not really because one can do: > > int fd = open("/dev/tpm0", O_RDWR); > fcntl(fd, F_SETFL, O_NONBLOCK); so move the condition to first need to queue ... James