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path: root/target/linux/generic/pending-5.4/333-arc-enable-unaligned-access-in-kernel-mode.patch
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From: Alexey Brodkin <abrodkin@synopsys.com>
Subject: arc: enable unaligned access in kernel mode

This enables misaligned access handling even in kernel mode.
Some wireless drivers (ath9k-htc and mt7601u) use misaligned accesses
here and there and to cope with that without fixing stuff in the drivers
we're just gracefully handling it on ARC.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---
 arch/arc/kernel/unaligned.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arc/kernel/unaligned.c
+++ b/arch/arc/kernel/unaligned.c
@@ -202,7 +202,7 @@ int misaligned_fixup(unsigned long addre
 	char buf[TASK_COMM_LEN];
 
 	/* handle user mode only and only if enabled by sysadmin */
-	if (!user_mode(regs) || !unaligned_enabled)
+	if (!unaligned_enabled)
 		return 1;
 
 	if (no_unaligned_warning) {
r: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -92,6 +92,12 @@ extern void			addrconf_join_solict(struc
 extern void			addrconf_leave_solict(struct inet6_dev *idev,
 					const struct in6_addr *addr);
 
+extern int			(*ipv6_dev_get_saddr_hook)(struct net *net,
+						struct net_device *dev,
+						const struct in6_addr *daddr,
+						unsigned int srcprefs,
+						struct in6_addr *saddr);
+
 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 						   unsigned int unit)
 {
--- a/net/bridge/Kconfig
+++ b/net/bridge/Kconfig
@@ -6,7 +6,6 @@ config BRIDGE
 	tristate "802.1d Ethernet Bridging"
 	select LLC
 	select STP
-	depends on IPV6 || IPV6=n
 	---help---
 	  If you say Y here, then your Linux box will be able to act as an
 	  Ethernet bridge, which means that the different Ethernet segments it
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -40,3 +40,4 @@ obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.
 obj-y += addrconf_core.o exthdrs_core.o
 
 obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
+obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_stubs.o
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1099,7 +1099,7 @@ out:
 	return ret;
 }
 
-int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
+static int __ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
 		       const struct in6_addr *daddr, unsigned int prefs,
 		       struct in6_addr *saddr)
 {
@@ -1224,7 +1224,6 @@ try_nextdev:
 	in6_ifa_put(hiscore->ifa);
 	return 0;
 }
-EXPORT_SYMBOL(ipv6_dev_get_saddr);
 
 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 		    unsigned char banned_flags)
@@ -4811,6 +4810,9 @@ int __init addrconf_init(void)
 
 	ipv6_addr_label_rtnl_register();
 
+	BUG_ON(ipv6_dev_get_saddr_hook != NULL);
+	rcu_assign_pointer(ipv6_dev_get_saddr_hook, __ipv6_dev_get_saddr);
+
 	return 0;
 errout:
 	rtnl_af_unregister(&inet6_ops);
@@ -4829,6 +4831,9 @@ void addrconf_cleanup(void)
 	struct net_device *dev;
 	int i;
 
+	rcu_assign_pointer(ipv6_dev_get_saddr_hook, NULL);
+	synchronize_rcu();
+
 	unregister_netdevice_notifier(&ipv6_dev_notf);
 	unregister_pernet_subsys(&addrconf_ops);
 	ipv6_addr_label_cleanup();
--- /dev/null
+++ b/net/ipv6/inet6_stubs.c
@@ -0,0 +1,33 @@
+/*
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+#include <linux/export.h>
+#include <net/ipv6.h>
+
+int (*ipv6_dev_get_saddr_hook)(struct net *net, struct net_device *dev,
+			const struct in6_addr *daddr, unsigned int srcprefs,
+			struct in6_addr *saddr);
+
+EXPORT_SYMBOL(ipv6_dev_get_saddr_hook);
+
+int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
+			const struct in6_addr *daddr, unsigned int prefs,
+			struct in6_addr *saddr)
+{
+	int ret = -EADDRNOTAVAIL;
+	typeof(ipv6_dev_get_saddr_hook) dev_get_saddr;
+
+	rcu_read_lock();
+	dev_get_saddr = rcu_dereference(ipv6_dev_get_saddr_hook);
+
+	if (dev_get_saddr)
+		ret = dev_get_saddr(net, dst_dev, daddr, prefs, saddr);
+
+	rcu_read_unlock();
+	return ret;
+}
+EXPORT_SYMBOL(ipv6_dev_get_saddr);
+