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Answer unknown ioctl commands quietly with -ENOTTY - #4
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dmdevfs now probes every node with the standard DMDRVI_IOCTL_BLOCK_GET_INFO (0x100) and DMDRVI_IOCTL_MONITOR_GET_POLICY (0x200) commands to classify it, so dmdma logged an "invalid ioctl command" error for every probe. Unknown commands are not an error for a driver: return -ENOTTY without logging, as dmdrvi documents. Also move dmdma's private commands to DMDRVI_IOCTL_CUSTOM_BASE (0x1000): they started at 1, colliding with the standard DMDRVI_IOCTL_NET_* range (0x01..), so a generic network probe would have been misread as a dmdma command. Callers using the enum names only need a rebuild. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016sVYVjrMNmMfPjWQkkGJTM
This was referenced Sep 30, 2026
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Problem
dmdevfs now probes every node with the standard
DMDRVI_IOCTL_BLOCK_GET_INFO(0x100) andDMDRVI_IOCTL_MONITOR_GET_POLICY(0x200) commands to classify it. dmdma treated these as errors, so the log filled with:Changes
-ENOTTY, no log. This is the dmdrvi convention for commands a driver does not implement, and dmdevfs reads any non-zero result as "not this class". Thedefault:branch of the switch changed the same way.DMDRVI_IOCTL_CUSTOM_BASE. They used to start at 1, which collides with the standardDMDRVI_IOCTL_NET_*range (0x01..0x05).dmdma_types.hnow includesdmdrvi_ioctl.h, sodmdma_portand the three test apps also link thedmdrvimodule headers.dmdma_ioctl_cmd_tchange. Callers that use the enum names only need a rebuild; hard-coded numbers must be updated. Out-of-repo users ofdmdma_lease.h/dmdma.h(e.g. peripheral drivers) now need the dmdrvi headers on their include path.Testing
A syntax-only compile (
gcc -fsyntax-only) against the dmdrvi/dmod headers shows no errors in the changed code. A full module build and a hardware run were not done here; CI checks the CMake changes.🤖 Generated with Claude Code
https://claude.ai/code/session_016sVYVjrMNmMfPjWQkkGJTM