diff options
| author | Alexander Bluhm <bluhm@cvs.openbsd.org> | 2024-01-06 10:58:46 +0000 |
|---|---|---|
| committer | Alexander Bluhm <bluhm@cvs.openbsd.org> | 2024-01-06 10:58:46 +0000 |
| commit | 3a62aa44389f62e3c1882453a2f52127e16354a5 (patch) | |
| tree | f6f16cebadab2c8a66c88faafc89268f41b466ee /sys/netinet/in.c | |
| parent | 0e15f6ca0303b5954586a8f02c9027f370722254 (diff) | |
Take net lock before kernel lock.
Doing KERNEL_LOCK() just before NET_LOCK() does not make sense.
Net lock is a rwlock that releases kernel lock during sleep. To
avoid an unnecessary release and take kernel lock cycle, move
KERNEL_LOCK() after NET_LOCK().
There is no lock order reversal deadlock issue. Both locks are
used in any order thoughout the kernel. As NET_LOCK() releases the
kernel lock when it cannot take the lock immediately and has to
sleep, we always end in the order kernel lock before net lock after
sleeping.
OK sashan@
Diffstat (limited to 'sys/netinet/in.c')
| -rw-r--r-- | sys/netinet/in.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/sys/netinet/in.c b/sys/netinet/in.c index d2207b3e124..7cf2cc6392c 100644 --- a/sys/netinet/in.c +++ b/sys/netinet/in.c @@ -1,4 +1,4 @@ -/* $OpenBSD: in.c,v 1.185 2023/06/28 11:49:49 kn Exp $ */ +/* $OpenBSD: in.c,v 1.186 2024/01/06 10:58:45 bluhm Exp $ */ /* $NetBSD: in.c,v 1.26 1996/02/13 23:41:39 christos Exp $ */ /* @@ -260,8 +260,8 @@ in_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, int privileged) return (error); } - KERNEL_LOCK(); NET_LOCK(); + KERNEL_LOCK(); TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET) @@ -331,8 +331,8 @@ in_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, int privileged) break; } err: - NET_UNLOCK(); KERNEL_UNLOCK(); + NET_UNLOCK(); return (error); } @@ -353,8 +353,8 @@ in_ioctl_set_ifaddr(u_long cmd, caddr_t data, struct ifnet *ifp) if (error) return (error); - KERNEL_LOCK(); NET_LOCK(); + KERNEL_LOCK(); TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET) @@ -387,8 +387,8 @@ in_ioctl_set_ifaddr(u_long cmd, caddr_t data, struct ifnet *ifp) if (!error) if_addrhooks_run(ifp); - NET_UNLOCK(); KERNEL_UNLOCK(); + NET_UNLOCK(); return error; } @@ -409,8 +409,8 @@ in_ioctl_change_ifaddr(u_long cmd, caddr_t data, struct ifnet *ifp) return (error); } - KERNEL_LOCK(); NET_LOCK(); + KERNEL_LOCK(); TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET) @@ -527,8 +527,8 @@ in_ioctl_change_ifaddr(u_long cmd, caddr_t data, struct ifnet *ifp) panic("%s: invalid ioctl %lu", __func__, cmd); } - NET_UNLOCK(); KERNEL_UNLOCK(); + NET_UNLOCK(); return (error); } |