On Sat, Mar 25, 2023 at 11:47:06PM +0800, Ye Xiang wrote: > +static void ljca_aux_release(struct device *dev) {} Sorry, but creating an empty release function just to shut the kernel up is NOT how to properly do this, you all know better. This is totally broken. The kernel was telling you what you had to do, don't think that you are being smarter than it by doing this, otherwise we would have never had the kernel spit out that error in the first place, right? Now I will ask you to follow the proper Intel kernel review rules and get proper approval for the patchset before submitting it to us again, as basic things like this are not supposed to be caught by us, but by your internal review process first. good luck! greg k-h