rust_binder: avoid allocating under node_refs for freeze listeners

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The node_refs mutex needs to be changed to a spinlock, so in preparation
for that, update freeze.rs to avoid allocating under the node_refs lock.
This is done by adding a retry loop so that if add_freeze_listener()
requires reallocating the KVVec<_> of freeze listeners, the caller will
allocate a larger vector and retry.

Analogously, the remove_freeze_listener() function is updated to return
the empty KVVec<_> when it is no longer needed, to avoid calling
kvfree() under the node_refs lock.

Reviewed-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20260615-binder-noderefs-spin-v3-1-3235f5a3e0a0@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Alice Ryhl 2026-06-15 12:36:41 +00:00 • committed by Greg Kroah-Hartman

parent 9e32d2a978

commit b9d17aa74d

2 changed files with 67 additions and 45 deletions

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65

drivers/android/binder/freeze.rs

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47

drivers/android/binder/node.rs

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