drm/arm/komeda: fix error handling for clk_prepare_enable() and callers

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komeda_dev_resume() calls clk_prepare_enable() without checking the
return value. If the clock fails to enable, the function returns 0
(success) while IRQs are enabled and IOMMU is connected on potentially
unclocked hardware, causing undefined behavior on resume.

Propagate the error from clk_prepare_enable() and fix all call sites
in komeda_drv.c that previously ignored the return value of
komeda_dev_resume():

- komeda_platform_probe(): if resume fails, jump to err_destroy_mdev
  (skipping the suspend call, since the clock was never enabled)
- komeda_pm_resume(): propagate the error and skip
  drm_mode_config_helper_resume() on failure

This issue was found by code review without access to Komeda hardware.

Signed-off-by: Gustavo Kenji Mendonça Kaneko <kaneko.dev@pm.me>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patch.msgid.link/20260609130828.1066038-1-kaneko.dev@pm.me
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

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This commit is contained in:

Gustavo Kenji Mendonça Kaneko 2026-06-09 13:08:33 +00:00 • committed by Liviu Dudau

parent 46f715a169

commit 6502eb8cfc

2 changed files with 14 additions and 6 deletions

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6

drivers/gpu/drm/arm/display/komeda/komeda_dev.c

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14

drivers/gpu/drm/arm/display/komeda/komeda_drv.c

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