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Driver core fix for 6.12-rc3

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Here is a single driver core fix, and a .mailmap update, for 6.12-rc3.
 
 The fix is for the rust driver core bindings, turned out that the
 from_raw binding wasn't a good idea (don't want to pass a pointer to a
 reference counted object without actually incrementing the pointer.)  So
 this change fixes it up as the from_raw binding came in in -rc1.
 
 The other change is a .mailmap update.
 
 Both have been in linux-next for a while with no reported issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-6.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here is a single driver core fix, and a .mailmap update.

  The fix is for the rust driver core bindings, turned out that the
  from_raw binding wasn't a good idea (don't want to pass a pointer to a
  reference counted object without actually incrementing the pointer.)
  So this change fixes it up as the from_raw binding came in in -rc1.

  The other change is a .mailmap update.

  Both have been in linux-next for a while with no reported issues"

* tag 'driver-core-6.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  mailmap: update mail for Fiona Behrens
  rust: device: change the from_raw() function
This commit is contained in:
Linus Torvalds 2024-10-13 09:10:52 -07:00
commit f683c9b134
3 changed files with 7 additions and 13 deletions
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3
.mailmap
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@ -210,6 +210,9 @@ Felix Moeller <felix@derklecks.de>
Fenglin Wu <quic_fenglinw@quicinc.com> <fenglinw@codeaurora.org>
Filipe Lautert <filipe@icewall.org>
Finn Thain <fthain@linux-m68k.org> <fthain@telegraphics.com.au>
Fiona Behrens <me@kloenk.dev>
Fiona Behrens <me@kloenk.dev> <me@kloenk.de>
Fiona Behrens <me@kloenk.dev> <fin@nyantec.com>
Franck Bui-Huu <vagabon.xyz@gmail.com>
Frank Rowand <frowand.list@gmail.com> <frank.rowand@am.sony.com>
Frank Rowand <frowand.list@gmail.com> <frank.rowand@sony.com>

15
rust/kernel/device.rs
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@ -51,18 +51,9 @@ impl Device {
///
/// It must also be ensured that `bindings::device::release` can be called from any thread.
/// While not officially documented, this should be the case for any `struct device`.
pub unsafe fn from_raw(ptr: *mut bindings::device) -> ARef<Self> {
// SAFETY: By the safety requirements, ptr is valid.
// Initially increase the reference count by one to compensate for the final decrement once
// this newly created `ARef<Device>` instance is dropped.
unsafe { bindings::get_device(ptr) };
// CAST: `Self` is a `repr(transparent)` wrapper around `bindings::device`.
let ptr = ptr.cast::<Self>();
// SAFETY: `ptr` is valid by the safety requirements of this function. By the above call to
// `bindings::get_device` we also own a reference to the underlying `struct device`.
unsafe { ARef::from_raw(ptr::NonNull::new_unchecked(ptr)) }
pub unsafe fn get_device(ptr: *mut bindings::device) -> ARef<Self> {
// SAFETY: By the safety requirements ptr is valid
unsafe { Self::as_ref(ptr) }.into()
}
/// Obtain the raw `struct device *`.

2
rust/kernel/firmware.rs
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@ -44,7 +44,7 @@ fn request_nowarn() -> Self {
///
/// # fn no_run() -> Result<(), Error> {
/// # // SAFETY: *NOT* safe, just for the example to get an `ARef<Device>` instance
/// # let dev = unsafe { Device::from_raw(core::ptr::null_mut()) };
/// # let dev = unsafe { Device::get_device(core::ptr::null_mut()) };
///
/// let fw = Firmware::request(c_str!("path/to/firmware.bin"), &dev)?;
/// let blob = fw.data();