Hi, On 2023/02/16 20:35, Greg Kroah-Hartman wrote: >> + if (bcd_version == 0x1) { >> + pr_vdebug("bcdVersion is expected to be 0x100, but it was 0x%x. ", >> + "Pass for compatibility, but fix your user space driver.\n", >> + bcd_version); > > No one will see a debug message :( > > Make this a much louder warning please. Okay, I will change it to pr_warn(). >> + pr_vdebug("bcdVersion is expected to be 0x100, but it was 0x%x. ", And, the comma at the end of this is my mistake. I intended it to be just a concatenation of strings. I will fix these in v2. By the way, is there a problem with the "notify because the value 0x1 is wrong" approach itself? Thank you, Yuta Hayama