Message-ID: <20240702233451.1238645-1-lyude@redhat.com>
Date: Tue,  2 Jul 2024 19:34:50 -0400
From: Lyude Paul <lyude@...hat.com>
To: dri-devel@...ts.freedesktop.org
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/panic: Fix uninitialized spinlock acquisition with CONFIG_DRM_PANIC=n

It turns out that if you happen to have a kernel config where
CONFIG_DRM_PANIC is disabled and spinlock debugging is enabled, along with
KMS being enabled - we'll end up trying to acquire an uninitialized
spin_lock with drm_panic_lock() when we try to do a commit:

  rvkms rvkms.0: [drm:drm_atomic_commit] committing 0000000068d2ade1
  INFO: trying to register non-static key.
  The code is fine but needs lockdep annotation, or maybe
  you didn't initialize this object before use?
  turning off the locking correctness validator.
  CPU: 4 PID: 1347 Comm: modprobe Not tainted 6.10.0-rc1Lyude-Test+ #272
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20240524-3.fc40 05/24/2024
  Call Trace:
   <TASK>
   dump_stack_lvl+0x77/0xa0
   assign_lock_key+0x114/0x120
   register_lock_class+0xa8/0x2c0
   __lock_acquire+0x7d/0x2bd0
   ? __vmap_pages_range_noflush+0x3a8/0x550
   ? drm_atomic_helper_swap_state+0x2ad/0x3a0
   lock_acquire+0xec/0x290
   ? drm_atomic_helper_swap_state+0x2ad/0x3a0
   ? lock_release+0xee/0x310
   _raw_spin_lock_irqsave+0x4e/0x70
   ? drm_atomic_helper_swap_state+0x2ad/0x3a0
   drm_atomic_helper_swap_state+0x2ad/0x3a0
   drm_atomic_helper_commit+0xb1/0x270
   drm_atomic_commit+0xaf/0xe0
   ? __pfx___drm_printfn_info+0x10/0x10
   drm_client_modeset_commit_atomic+0x1a1/0x250
   drm_client_modeset_commit_locked+0x4b/0x180
   drm_client_modeset_commit+0x27/0x50
   __drm_fb_helper_restore_fbdev_mode_unlocked+0x76/0x90
   drm_fb_helper_set_par+0x38/0x40
   fbcon_init+0x3c4/0x690
   visual_init+0xc0/0x120
   do_bind_con_driver+0x409/0x4c0
   do_take_over_console+0x233/0x280
   do_fb_registered+0x11f/0x210
   fbcon_fb_registered+0x2c/0x60
   register_framebuffer+0x248/0x2a0
   __drm_fb_helper_initial_config_and_unlock+0x58a/0x720
   drm_fbdev_generic_client_hotplug+0x6e/0xb0
   drm_client_register+0x76/0xc0
   _RNvXs_CsHeezP08sTT_5rvkmsNtB4_5RvkmsNtNtCs1cdwasc6FUb_6kernel8platform6Driver5probe+0xed2/0x1060 [rvkms]
   ? _RNvMs_NtCs1cdwasc6FUb_6kernel8platformINtB4_7AdapterNtCsHeezP08sTT_5rvkms5RvkmsE14probe_callbackBQ_+0x2b/0x70 [rvkms]
   ? acpi_dev_pm_attach+0x25/0x110
   ? platform_probe+0x6a/0xa0
   ? really_probe+0x10b/0x400
   ? __driver_probe_device+0x7c/0x140
   ? driver_probe_device+0x22/0x1b0
   ? __device_attach_driver+0x13a/0x1c0
   ? __pfx___device_attach_driver+0x10/0x10
   ? bus_for_each_drv+0x114/0x170
   ? __device_attach+0xd6/0x1b0
   ? bus_probe_device+0x9e/0x120
   ? device_add+0x288/0x4b0
   ? platform_device_add+0x75/0x230
   ? platform_device_register_full+0x141/0x180
   ? rust_helper_platform_device_register_simple+0x85/0xb0
   ? _RNvMs2_NtCs1cdwasc6FUb_6kernel8platformNtB5_6Device13create_simple+0x1d/0x60
   ? _RNvXs0_CsHeezP08sTT_5rvkmsNtB5_5RvkmsNtCs1cdwasc6FUb_6kernel6Module4init+0x11e/0x160 [rvkms]
   ? 0xffffffffc083f000
   ? init_module+0x20/0x1000 [rvkms]
   ? kernfs_xattr_get+0x3e/0x80
   ? do_one_initcall+0x148/0x3f0
   ? __lock_acquire+0x5ef/0x2bd0
   ? __lock_acquire+0x5ef/0x2bd0
   ? __lock_acquire+0x5ef/0x2bd0
   ? put_cpu_partial+0x51/0x1d0
   ? lock_acquire+0xec/0x290
   ? put_cpu_partial+0x51/0x1d0
   ? lock_release+0xee/0x310
   ? put_cpu_partial+0x51/0x1d0
   ? fs_reclaim_acquire+0x69/0xf0
   ? lock_acquire+0xec/0x290
   ? fs_reclaim_acquire+0x69/0xf0
   ? kfree+0x22f/0x340
   ? lock_release+0xee/0x310
   ? kmalloc_trace_noprof+0x48/0x340
   ? do_init_module+0x22/0x240
   ? kmalloc_trace_noprof+0x155/0x340
   ? do_init_module+0x60/0x240
   ? __se_sys_finit_module+0x2e0/0x3f0
   ? do_syscall_64+0xa4/0x180
   ? syscall_exit_to_user_mode+0x108/0x140
   ? do_syscall_64+0xb0/0x180
   ? vma_end_read+0xd0/0xe0
   ? do_user_addr_fault+0x309/0x640
   ? clear_bhb_loop+0x45/0xa0
   ? clear_bhb_loop+0x45/0xa0
   ? clear_bhb_loop+0x45/0xa0
   ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
   </TASK>

Fix this by stubbing these macros out when this config option isn't
enabled, along with fixing the unused variable warning that introduces.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 2 +-
 include/drm/drm_panic.h             | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index fb97b51b38f15..dd5caa8030aa3 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3017,7 +3017,7 @@ int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 				  bool stall)
 {
 	int i, ret;
-	unsigned long flags;
+	unsigned long __maybe_unused flags;
 	struct drm_connector *connector;
 	struct drm_connector_state *old_conn_state, *new_conn_state;
 	struct drm_crtc *crtc;
diff --git a/include/drm/drm_panic.h b/include/drm/drm_panic.h
index 822dbb1aa9d6f..9cd4239f09286 100644
--- a/include/drm/drm_panic.h
+++ b/include/drm/drm_panic.h
@@ -52,6 +52,8 @@ struct drm_scanout_buffer {
 	unsigned int pitch[DRM_FORMAT_MAX_PLANES];
 };
 
+#ifdef CONFIG_DRM_PANIC
+
 /**
  * drm_panic_trylock - try to enter the panic printing critical section
  * @dev: struct drm_device
@@ -137,13 +139,15 @@ struct drm_scanout_buffer {
 #define drm_panic_unlock(dev, flags) \
 	raw_spin_unlock_irqrestore(&(dev)->mode_config.panic_lock, flags)
 
-#ifdef CONFIG_DRM_PANIC
-
 void drm_panic_register(struct drm_device *dev);
 void drm_panic_unregister(struct drm_device *dev);
 
 #else
 
+#define drm_panic_trylock(dev, flags) (true)
+#define drm_panic_lock(dev, flags)
+#define drm_panic_unlock(dev, flags)
+
 static inline void drm_panic_register(struct drm_device *dev) {}
 static inline void drm_panic_unregister(struct drm_device *dev) {}
 
-- 
2.45.2

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