path: root/sys/net
diff options
authorMark Johnston <markj@FreeBSD.org>2021-02-19 22:08:34 +0000
committerMark Johnston <markj@FreeBSD.org>2021-02-19 22:10:41 +0000
commit0f9544d03e89d180f94a7a84b110ec7d2b6c625a (patch)
tree2109e8fac778f694c97964ef8612dedc2feb2f80 /sys/net
parentd2b3fadf2db56131376a71b0597876b591a6aee4 (diff)
iflib: Fix detach of pseudo interfaces
In commit 38bfc6dee33b we added an IFDI_DETACH() call to iflib_pseudo_deregister() since it looked like it was missing. One is present in the error-handling path of iflib_pseudo_register(). However, the detach actually comes from the DEVICE_DETACH() method for the above-mentioned device_t, so now we're calling IFDI_DETACH() twice when destroying a pseudo interface. Fix the problem by not calling IFDI_DETACH() from the device detach routine. This way we can ensure that iflib de-initialization always happens in a consistent order. It also ensures that you can't do silly things like "devctl detach <pseudo ifnet>", which would previously detach the driver without tearing down the corresponding ifnet. PR: 253541 Reviewed by: erj MFC after: 1 week Fixes: 38bfc6dee33b Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D28774
Diffstat (limited to 'sys/net')
1 files changed, 3 insertions, 5 deletions
diff --git a/sys/net/iflib_clone.c b/sys/net/iflib_clone.c
index dc4ccbee659f..975873c4a19c 100644
--- a/sys/net/iflib_clone.c
+++ b/sys/net/iflib_clone.c
@@ -81,13 +81,11 @@ int
iflib_pseudo_detach(device_t dev)
if_ctx_t ctx;
- uint32_t ifc_flags;
ctx = device_get_softc(dev);
- ifc_flags = iflib_get_flags(ctx);
- if ((ifc_flags & IFC_INIT_DONE) == 0)
- return (0);
- return (IFDI_DETACH(ctx));
+ if ((iflib_get_flags(ctx) & IFC_IN_DETACH) == 0)
+ return (EBUSY);
+ return (0);
static device_t iflib_pseudodev;