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net: page_pool: Don't recycle into cache on PREEMPT_RT

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With preemptible softirq and no per-CPU locking in local_bh_disable() on
PREEMPT_RT the consumer can be preempted while a skb is returned.

Avoid the race by disabling the recycle into the cache on PREEMPT_RT.

Cc: Jesper Dangaard Brouer <hawk@kernel.org>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20250512092736.229935-2-bigeasy@linutronix.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Sebastian Andrzej Siewior 2025-05-12 11:27:22 +02:00 committed by Paolo Abeni
parent 67fa756408
commit 32471b2f48
1 changed files with 4 additions and 0 deletions
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4
net/core/page_pool.c
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@ -839,6 +839,10 @@ static bool page_pool_napi_local(const struct page_pool *pool)
const struct napi_struct *napi;
u32 cpuid;
/* On PREEMPT_RT the softirq can be preempted by the consumer */
if (IS_ENABLED(CONFIG_PREEMPT_RT))
return false;
if (unlikely(!in_softirq()))
return false;