Quoting Dmitry Baryshkov (2022-04-11 16:49:53)
> Add calls to drm_bridge_add()/drm_bridge_remove() DRM bridges created by
> the driver. This fixes the following warning.
>
> WARNING: CPU: 0 PID: 1 at kernel/locking/mutex.c:579 __mutex_lock+0x840/0x9f4
> DEBUG_LOCKS_WARN_ON(lock->magic != lock)
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.18.0-rc1-00002-g3054695a0d27-dirty #55
> Hardware name: Generic DT based system
> unwind_backtrace from show_stack+0x10/0x14
> show_stack from dump_stack_lvl+0x58/0x70
> dump_stack_lvl from __warn+0xc8/0x1e8
> __warn from warn_slowpath_fmt+0x78/0xa8
> warn_slowpath_fmt from __mutex_lock+0x840/0x9f4
> __mutex_lock from mutex_lock_nested+0x1c/0x24
> mutex_lock_nested from drm_bridge_hpd_enable+0x2c/0x84
> drm_bridge_hpd_enable from msm_hdmi_modeset_init+0xc0/0x21c
> msm_hdmi_modeset_init from mdp4_kms_init+0x53c/0x90c
> mdp4_kms_init from msm_drm_bind+0x514/0x698
> msm_drm_bind from try_to_bring_up_aggregate_device+0x160/0x1bc
> try_to_bring_up_aggregate_device from component_master_add_with_match+0xc4/0xf8
> component_master_add_with_match from msm_pdev_probe+0x274/0x350
> msm_pdev_probe from platform_probe+0x5c/0xbc
> platform_probe from really_probe.part.0+0x9c/0x290
> really_probe.part.0 from __driver_probe_device+0xa8/0x13c
> __driver_probe_device from driver_probe_device+0x34/0x10c
> driver_probe_device from __driver_attach+0xbc/0x178
> __driver_attach from bus_for_each_dev+0x74/0xc0
> bus_for_each_dev from bus_add_driver+0x160/0x1e4
> bus_add_driver from driver_register+0x88/0x118
> driver_register from do_one_initcall+0x6c/0x334
> do_one_initcall from kernel_init_freeable+0x1bc/0x220
> kernel_init_freeable from kernel_init+0x18/0x12c
> kernel_init from ret_from_fork+0x14/0x2c
>
> Fixes: 3d3f8b1f8b62 ("drm/bridge: make bridge registration independent of drm flow")
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> ---
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
