Re: [PATCH RFC v4 1/4] iommu/arm-smmu-v3: Skip duplicate SIDs when erasing streams from RB tree

[Nicolin Chen]

On Thu, Oct 01, 2026 at 08:49:58PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@xxxxxxx>
> 
> Bridged PCI devices may end up with duplicated Stream IDs in
> master->streams[].  During insertion, rb_find_add() silently
> drops the duplicate node when it collides with an already-inserted
> entry from the same master, leaving the duplicate's rb_node in an
> uninitialized state.

There is already a cleaner fix:
https://lore.kernel.org/linux-iommu/76c5f9dde30269995ef842a12a3a5e1ebaa3e6df.1790188510.git.nicolinc@xxxxxxxxxx/

Hopefully Will can take it soon.

Nicolin