[][MAC80211][core][Fix mtk_eth_setup_tc_block panic issue]
[Description]
Fix mtk_eth_setup_tc_block panic issue.
This patch backport from linux-6.3.
If without this patch, the kernel might panic in
the mtk_eth_setup_tc_block() when create/add/remove tc rule.
[Release-log]
N/A
Change-Id: Ie9e6646367755e49f1efa0a1109ce883008a0917
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7596027
diff --git a/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/999-3003-mt7622-backport-nf-hw-offload-framework-and-ups.patch b/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/999-3003-mt7622-backport-nf-hw-offload-framework-and-ups.patch
index e018c83..b52782f 100755
--- a/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/999-3003-mt7622-backport-nf-hw-offload-framework-and-ups.patch
+++ b/autobuild_mac80211_release/target/linux/mediatek/patches-5.4/999-3003-mt7622-backport-nf-hw-offload-framework-and-ups.patch
@@ -1266,7 +1266,7 @@
index 000000000..4294f0c74
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
-@@ -0,0 +1,541 @@
+@@ -0,0 +1,535 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Felix Fietkau <nbd@nbd.name>
@@ -1735,14 +1735,11 @@
+{
+ struct mtk_mac *mac = netdev_priv(dev);
+ struct mtk_eth *eth = mac->hw;
-+ struct nf_flowtable *flowtable;
+ static LIST_HEAD(block_cb_list);
+ struct flow_block_cb *block_cb;
+ flow_setup_cb_t *cb;
+ int err = 0;
+
-+ flowtable = container_of(f->block, struct nf_flowtable, flow_block);
-+
+ if (!eth->ppe.foe_table)
+ return -EOPNOTSUPP;
+
@@ -1752,8 +1749,6 @@
+ cb = mtk_eth_setup_tc_block_cb;
+ f->driver_block_list = &block_cb_list;
+
-+ down_write(&flowtable->flow_block_lock);
-+
+ switch (f->command) {
+ case FLOW_BLOCK_BIND:
+ block_cb = flow_block_cb_lookup(f->block, cb, dev);
@@ -1788,7 +1783,6 @@
+ }
+
+unlock:
-+ up_write(&flowtable->flow_block_lock);
+ return err;
+}
+
@@ -4922,7 +4916,7 @@
index 000000000..d94c6fb92
--- /dev/null
+++ b/net/netfilter/nf_flow_table_offload.c
-@@ -0,0 +1,1197 @@
+@@ -0,0 +1,1199 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
@@ -5766,7 +5760,7 @@
+ if (cmd == FLOW_CLS_REPLACE)
+ cls_flow.rule = flow_rule->rule;
+
-+ down_write(&flowtable->flow_block_lock);
++ down_read(&flowtable->flow_block_lock);
+ list_for_each_entry(block_cb, block_cb_list, list) {
+ err = block_cb->cb(TC_SETUP_CLSFLOWER, &cls_flow,
+ block_cb->cb_priv);
@@ -5775,7 +5769,7 @@
+
+ i++;
+ }
-+ up_write(&flowtable->flow_block_lock);
++ up_read(&flowtable->flow_block_lock);
+
+ if (cmd == FLOW_CLS_STATS)
+ memcpy(stats, &cls_flow.stats, sizeof(*stats));
@@ -5994,7 +5988,7 @@
+ struct flow_block_cb *block_cb, *next;
+ int err = 0;
+
-+ down_read(&flowtable->flow_block_lock);
++ down_write(&flowtable->flow_block_lock);
+
+ switch (cmd) {
+ case FLOW_BLOCK_BIND:
@@ -6011,7 +6005,7 @@
+ err = -EOPNOTSUPP;
+ }
+
-+ up_read(&flowtable->flow_block_lock);
++ up_write(&flowtable->flow_block_lock);
+
+ return err;
+}
@@ -6057,7 +6051,9 @@
+
+ nf_flow_table_block_offload_init(bo, dev_net(dev), cmd, flowtable,
+ extack);
++ down_write(&flowtable->flow_block_lock);
+ err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_FT, bo);
++ up_write(&flowtable->flow_block_lock);
+ if (err < 0)
+ return err;
+