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Providing access to the underlying `struct miscdevice` is useful for various reasons. For example, this allows you access the miscdevice's internal `struct device` for use with the `dev_*` printing macros. Note that since the underlying `struct miscdevice` could get freed at any point after the fops->open() call (if misc_deregister is called), only the open call is given access to it. To use `dev_*` printing macros from other fops hooks, take a refcount on `miscdevice->this_device` to keep it alive. See the linked thread for further discussion on the lifetime of `struct miscdevice`. Link: https://lore.kernel.org/r/2024120951-botanist-exhale-4845@gregkh Signed-off-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Lee Jones <lee@kernel.org> Tested-by: Lee Jones <lee@kernel.org> Reviewed-by: Danilo Krummrich <dakr@kernel.org> Link: https://lore.kernel.org/r/20241210-miscdevice-file-param-v3-2-b2a79b666dc5@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| build_error.rs | ||
| compiler_builtins.rs | ||
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| ffi.rs | ||
| Makefile | ||