rust: pci: convert IrqVectorRegistration to a lifetime-managed owning type

Convert IrqVectorRegistration from a devres-managed internal type to a
lifetime-annotated type that owns the PCI interrupt vector allocation.
Dropping it frees the vectors.

IrqVector gains a reference to the IrqVectorRegistration it was derived
from. Since index() borrows the registration, the compiler prevents the
allocation from being dropped while any IrqVector (and hence any
irq::Registration built from it) is still live.

alloc_irq_vectors() returns IrqVectorRegistration<'_> directly, giving
drivers explicit control over the allocation lifetime, which is needed
by net and block drivers that re-allocate vectors at runtime, e.g.
during queue reconfiguration or device recovery.

Tested-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-2-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

0 files changed, 0 insertions, 0 deletions