On Mon, Jan 05, 2026 at 09:43:31AM +0100, Lorenzo Bianconi wrote:

quoted

airoha_ppe_deinit() runs airoha_npu_ppe_deinit() in atomic context.
airoha_npu_ppe_deinit routine allocates ppe_data buffer with GFP_KERNEL
flag. Rely on rcu_replace_pointer in airoha_ppe_deinit routine in order
to fix schedule while atomic issue in airoha_npu_ppe_deinit() since we
do not need atomic context there.

Hi Lorenzo,

Hi Simon,

If I understand things correctly the key problem here is that
an allocation with GFP_KERNEL implies GFP_RECLAIM and thus may sleep.
But RCU read-side critical sections are not allowed to sleep in non-RT
kernels.

yes, right, RCU section is atomic.

If so, I think it would be clearer to describe the problem along those
lines. But maybe it is just me.

This patch is already in Linus's tree.

Regards,
Lorenzo

quoted

Fixes: 00a7678310fe3 ("net: airoha: Introduce flowtable offload support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
Changes in v2:
- Update commit log.
- Link to v1: https://lore.kernel.org/r/20251223-airoha-fw-ethtool-v1-1-1dbd1568c585@kernel.org (local)

...