Commit 795dbde9 authored by Janusz Krzysztofik's avatar Janusz Krzysztofik Committed by Daniele Ceraolo Spurio
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drm/i915/huc: Fix fence not released on early probe errors

HuC delayed loading fence, introduced with commit 27536e03
("drm/i915/huc: track delayed HuC load with a fence"), is registered with
object tracker early on driver probe but unregistered only from driver
remove, which is not called on early probe errors.  Since its memory is
allocated under devres, then released anyway, it may happen to be
allocated again to the fence and reused on future driver probes, resulting
in kernel warnings that taint the kernel:

<4> [309.731371] ------------[ cut here ]------------
<3> [309.731373] ODEBUG: init destroyed (active state 0) object: ffff88813d7dd2e0 object type: i915_sw_fence hint: sw_fence_dummy_notify+0x0/0x20 [i915]
<4> [309.731575] WARNING: CPU: 2 PID: 3161 at lib/debugobjects.c:612 debug_print_object+0x93/0xf0
...
<4> [309.731693] CPU: 2 UID: 0 PID: 3161 Comm: i915_module_loa Tainted: G     U             6.14.0-CI_DRM_16362-gf0fd77956987+ #1
...
<4> [309.731700] RIP: 0010:debug_print_object+0x93/0xf0
...
<4> [309.731728] Call Trace:
<4> [309.731730]  <TASK>
...
<4> [309.731949]  __debug_object_init+0x17b/0x1c0
<4> [309.731957]  debug_object_init+0x34/0x50
<4> [309.732126]  __i915_sw_fence_init+0x34/0x60 [i915]
<4> [309.732256]  intel_huc_init_early+0x4b/0x1d0 [i915]
<4> [309.732468]  intel_uc_init_early+0x61/0x680 [i915]
<4> [309.732667]  intel_gt_common_init_early+0x105/0x130 [i915]
<4> [309.732804]  intel_root_gt_init_early+0x63/0x80 [i915]
<4> [309.732938]  i915_driver_probe+0x1fa/0xeb0 [i915]
<4> [309.733075]  i915_pci_probe+0xe6/0x220 [i915]
<4> [309.733198]  local_pci_probe+0x44/0xb0
<4> [309.733203]  pci_device_probe+0xf4/0x270
<4> [309.733209]  really_probe+0xee/0x3c0
<4> [309.733215]  __driver_probe_device+0x8c/0x180
<4> [309.733219]  driver_probe_device+0x24/0xd0
<4> [309.733223]  __driver_attach+0x10f/0x220
<4> [309.733230]  bus_for_each_dev+0x7d/0xe0
<4> [309.733236]  driver_attach+0x1e/0x30
<4> [309.733239]  bus_add_driver+0x151/0x290
<4> [309.733244]  driver_register+0x5e/0x130
<4> [309.733247]  __pci_register_driver+0x7d/0x90
<4> [309.733251]  i915_pci_register_driver+0x23/0x30 [i915]
<4> [309.733413]  i915_init+0x34/0x120 [i915]
<4> [309.733655]  do_one_initcall+0x62/0x3f0
<4> [309.733667]  do_init_module+0x97/0x2a0
<4> [309.733671]  load_module+0x25ff/0x2890
<4> [309.733688]  init_module_from_file+0x97/0xe0
<4> [309.733701]  idempotent_init_module+0x118/0x330
<4> [309.733711]  __x64_sys_finit_module+0x77/0x100
<4> [309.733715]  x64_sys_call+0x1f37/0x2650
<4> [309.733719]  do_syscall_64+0x91/0x180
<4> [309.733763]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
<4> [309.733792]  </TASK>
...
<4> [309.733806] ---[ end trace 0000000000000000 ]---

That scenario is most easily reproducible with
igt@i915_module_load@reload-with-fault-injection.

Fix the issue by moving the cleanup step to driver release path.

Fixes: 27536e03 ("drm/i915/huc: track delayed HuC load with a fence")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13592


Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Signed-off-by: default avatarJanusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Reviewed-by: default avatarDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: default avatarKrzysztof Karas <krzysztof.karas@intel.com>
Signed-off-by: default avatarDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://lore.kernel.org/r/20250402172057.209924-2-janusz.krzysztofik@linux.intel.com
parent 4e22d5b8
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