rust: dma: tie CoherentHandle to the device's bound lifetime

Add a lifetime parameter to CoherentHandle that ties the DMA allocation
to the device's bound scope, ensuring it is freed before the device is
unbound.

DMA allocations carry device resources (e.g. IOMMU mappings) that must
not outlive the device's bound lifetime. Without a lifetime parameter,
there was no compile-time enforcement that a CoherentHandle is dropped
before the device is unbound.

Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260830193824.471089-3-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

0 files changed, 0 insertions, 0 deletions