Re: [PATCH] i3c: mipi-i3c-hci: fix atomic updates to RING_OPERATION1 register

[Frank Li]

On Tue, Mar 31, 2026 at 08:12:23PM +0800, Billy Tsai wrote:
> The RING_OPERATION1 register contains multiple bitfields (enqueue,
> software dequeue, and IBI dequeue pointers) that are updated from
> different contexts. Because these updates are performed via
> read-modify-write sequences, concurrent access from process and IRQ
> contexts can lead to lost updates.
>
> Example:
> CPU 0 (hci_dma_queue_xfer): reads RING_OPERATION1 (enq=5, deq=2)
> CPU 1 (hci_dma_xfer_done): reads RING_OPERATION1 (enq=5, deq=2)

Add Adrian Hunter <adrian.hunter@xxxxxxxxx>, who add lock at equeue.

https://lore.kernel.org/linux-i3c/20260306072451.11131-6-adrian.hunter@xxxxxxxxx/

Dose above patch fix your problem ?

Frank