On Thu, Dec 16, 2021 at 11:24:36PM +0800, Greg KH wrote: > Did you run the kernel before your change and then after your change to > ensure that the failure you saw before your change is now properly > fixed? > > How did you test this? Thank you for your answer. But I haven't run it yet. And in fact I don't know how to trigger the alloc failure. I just find the other place like eni_init_one() in `drivers/atm/eni.c` check the return value of the dma_alloc_coherent(). So that's possible to alloc failure. Therefore, in order to avoid the dereference of the null pointer, it might be better to deal with it. Sincerely thanks, jiasheng jiang
