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2455d5f2d5
DRM ioctls do not guarantee that the parent bus device is still bound. However, since DRM device registration is managed through Devres, using drm_dev_unplug() on unregistration ensures that between drm_dev_enter() and drm_dev_exit() the parent device must be bound. Add RegistrationGuard, a guard object representing a drm_dev_enter/exit SRCU critical section that dereferences to &Device<T, Registered>. The guard is obtained from Device<T, Ioctl> and proves at runtime that the device is still registered. Switch Registration::drop from drm_dev_unregister() to drm_dev_unplug() to provide the SRCU barrier that RegistrationGuard's safety argument relies on. Reviewed-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Tested-by: Deborah Brouwer <deborah.brouwer@collabora.com> Link: https://patch.msgid.link/20260628145406.2107056-13-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org>
27 lines
588 B
Rust
27 lines
588 B
Rust
// SPDX-License-Identifier: GPL-2.0 OR MIT
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//! DRM subsystem abstractions.
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pub mod device;
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pub mod driver;
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pub mod file;
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pub mod gem;
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pub mod gpuvm;
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pub mod ioctl;
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pub use self::device::Device;
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pub use self::device::DeviceContext;
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pub use self::device::Ioctl;
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pub use self::device::Normal;
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pub use self::device::Registered;
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pub use self::device::RegistrationGuard;
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pub use self::device::UnregisteredDevice;
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pub use self::driver::Driver;
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pub use self::driver::DriverInfo;
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pub use self::driver::Registration;
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pub use self::file::File;
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pub(crate) mod private {
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pub trait Sealed {}
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}
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