This fixes an issue in platform device code where, if we specify a software node for a platform device using struct platform_device_info, it will not be removed on device .release().
This is an extended approach from v4 where we also first introduce necessary changes in drivers where the fix may cause a regression. Merging strategy: Danilo suggested that the new interface we add in this series as well as prerequisite driver changes can still land in v7.1 so I think the entire series should go upstream through the driver core. The first 5 patches are part of the fix and the remaining two add tests which can't really do harm. DRM and platform maintainers: please Ack the two driver patches in this series. Signed-off-by: Bartosz Golaszewski <[email protected]> --- Changes in v5: - Provide a helper for users of platform_device_alloc() that wish to assign a software node to a platform device - Rework drivers that could regress after the swnode leak fix - Split the series into several patches as necessary - Link to v4: https://patch.msgid.link/20260430-swnode-remove-on-dev-unreg-v4-0-01574da0a...@oss.qualcomm.com Changes in v4: - Drop redundant !pdevinfo->swnode check in platform_device_register_full() - Handle all three combinations with which two software nodes can be assigned to a platform device - Extend the new kunit test to verify all three combinations - Link to v3: https://patch.msgid.link/20260428-swnode-remove-on-dev-unreg-v3-0-533bdc71b...@oss.qualcomm.com Changes in v3: - Make sure the reference of the primary software node we possibly take, is always released by moving the get() before calls that may fail - Don't allow passing two software nodes - Add a test case for that situation - Link to v2: https://patch.msgid.link/20260423-swnode-remove-on-dev-unreg-v2-0-0e5213cde...@oss.qualcomm.com Changes in v2: - Change the order between removing the software node and dropping the reference to the device's OF node - Address a situation where a software node is used as the primary firmware node - Add a patch adding a new kunit helper - Add another test case - Link to v1: https://patch.msgid.link/20260410-swnode-remove-on-dev-unreg-v1-0-cd7d305f3...@oss.qualcomm.com --- Bartosz Golaszewski (7): platform/surface: gpe: use platform_device_register_full() driver core: platform: make the swnode check stricter driver core: platform: provide platform_device_add_software_node() drm/xe/i2c: use platform_device_add_software_node() driver core: platform: remove software node on release() kunit: provide kunit_software_node_register() driver core: platform: tests: add test cases for correct swnode removal drivers/base/platform.c | 44 +++++++- drivers/base/test/platform-device-test.c | 168 +++++++++++++++++++++++++++++++ drivers/gpu/drm/xe/xe_i2c.c | 21 ++-- drivers/platform/surface/surface_gpe.c | 36 ++----- include/kunit/fwnode.h | 19 ++++ include/linux/platform_device.h | 3 + lib/kunit/Makefile | 3 +- lib/kunit/fwnode.c | 52 ++++++++++ 8 files changed, 307 insertions(+), 39 deletions(-) --- base-commit: 5d6919055dec134de3c40167a490f33c74c12581 change-id: 20260410-swnode-remove-on-dev-unreg-42bfc4b23ba8 Best regards, -- Bartosz Golaszewski <[email protected]>
