[openwrt/openwrt] kernel: fix warning on retrying page pool release

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch openwrt-24.10:
https://git.openwrt.org/ba37852951743f0348b89a6172d30179fa138b04

commit ba37852951743f0348b89a6172d30179fa138b04
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Thu May 15 15:41:37 2025 +0200

    kernel: fix warning on retrying page pool release
    
    Fixes the following warning:
    [  180.314652] NOHZ tick-stop error: local softirq work is pending, handler #08!!!
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
    (cherry picked from commit 610dd871aa59baef063cdc79bf57be92a0c45474)
---
 ...net-page_pool-try-to-free-deferred-skbs-while-waitin.patch | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/target/linux/generic/hack-6.6/610-net-page_pool-try-to-free-deferred-skbs-while-waitin.patch b/target/linux/generic/hack-6.6/610-net-page_pool-try-to-free-deferred-skbs-while-waitin.patch
index 85cd79f1a9..cfe35bc51a 100644
--- a/target/linux/generic/hack-6.6/610-net-page_pool-try-to-free-deferred-skbs-while-waitin.patch
+++ b/target/linux/generic/hack-6.6/610-net-page_pool-try-to-free-deferred-skbs-while-waitin.patch
@@ -16,16 +16,17 @@ Signed-off-by: Felix Fietkau <nbd at nbd.name>
 
 --- a/net/core/page_pool.c
 +++ b/net/core/page_pool.c
-@@ -873,7 +873,7 @@ static void page_pool_release_retry(stru
+@@ -873,7 +873,8 @@ static void page_pool_release_retry(stru
  {
  	struct delayed_work *dwq = to_delayed_work(wq);
  	struct page_pool *pool = container_of(dwq, typeof(*pool), release_dw);
 -	int inflight;
++	unsigned long flags;
 +	int cpu, inflight;
  
  	inflight = page_pool_release(pool);
  	/* In rare cases, a driver bug may cause inflight to go negative.
-@@ -885,6 +885,17 @@ static void page_pool_release_retry(stru
+@@ -885,6 +886,21 @@ static void page_pool_release_retry(stru
  	if (inflight <= 0)
  		return;
  
@@ -33,12 +34,16 @@ Signed-off-by: Felix Fietkau <nbd at nbd.name>
 +	 * defer_list that can stay in the list until we have enough queued
 +	 * traffic.
 +	 */
++	local_irq_save(flags);
 +	for_each_online_cpu(cpu) {
 +		struct softnet_data *sd = &per_cpu(softnet_data, cpu);
 +
-+		if (!cmpxchg(&sd->defer_ipi_scheduled, 0, 1))
++		if (cpu == raw_smp_processor_id())
++			raise_softirq_irqoff(NET_RX_SOFTIRQ);
++		else if (!cmpxchg(&sd->defer_ipi_scheduled, 0, 1))
 +			smp_call_function_single_async(cpu, &sd->defer_csd);
 +	}
++	local_irq_restore(flags);
 +
  	/* Periodic warning */
  	if (time_after_eq(jiffies, pool->defer_warn)) {