Under what conditions does the linux kernel ignore an ioctl call from userspace?

Question

linux

Why does the kernel ignore the user's ioctl request when working through the 0xff configuration node? Although on it the device opens and closes correctly. When working through other nodes 0x1, 0x0, ... there are no problems.

Answer 1

when working through the configuration node 0xff

When working through what?
You look under strace to see what goes there and what comes back.

Answer 2

there are so-called. files - nodes, through them work with the driver is carried out. For example
int fd = open("/dev/vendor/node-0", O_RDWR);
And how to look under strace?

Answer 3

Re-clone the repository.