What are the specific cases where static allocation of major numbers are required(i.e the necessity to create device nodes in advance) ?
What are the specific cases where static allocation of major numbers are required(i.e the
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What are the specific cases where static allocation of major numbers are required(i.e the necessity to create device nodes in advance) ?
Static allocation of major numbers is usually used for most common devices. A list of those devices can be found in Documentation/devices.txt within the kernel source tree.
If you’re developing a driver for your own use you can use static assigning as long as you use a number that appears to be unused. But if your driver will be deployed more widely picking a random number and assigning it like this can eventually cause conflicts, so it might be better to use dynamic allocation.
Linux Device Drivers, 3rd Edition