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| author | Vincenzo Maffione <vmaffione@FreeBSD.org> | 2022-01-14 21:09:04 +0000 |
|---|---|---|
| committer | Vincenzo Maffione <vmaffione@FreeBSD.org> | 2022-01-14 21:09:04 +0000 |
| commit | e0e12405285b61a724c646b8f8e99e3ec775291e (patch) | |
| tree | 9ce5f15b7685f8a60072b4b297c34eab39072b53 /sys/net/iflib.c | |
| parent | 9f0b56872c1fb790f67ee45a56ceeeed5d17ddea (diff) | |
| download | src-e0e12405285b61a724c646b8f8e99e3ec775291e.tar.gz src-e0e12405285b61a724c646b8f8e99e3ec775291e.zip | |
netmap: fix LOR in iflib_netmap_register
In iflib_device_register(), the CTX_LOCK is acquired first and then
IFNET_WLOCK is acquired by ether_ifattach(). However, in netmap_hw_reg()
we do the opposite: IFNET_RLOCK is acquired first, and then CTX_LOCK
is acquired by iflib_netmap_register(). Fix this LOR issue by wrapping
the CTX_LOCK/UNLOCK calls in iflib_device_register with an additional
IFNET_WLOCK. This is safe since the IFNET_WLOCK is recursive.
MFC after: 1 month
Diffstat (limited to 'sys/net/iflib.c')
| -rw-r--r-- | sys/net/iflib.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/net/iflib.c b/sys/net/iflib.c index 3fcab699f9e0..88027a6dc283 100644 --- a/sys/net/iflib.c +++ b/sys/net/iflib.c @@ -5057,6 +5057,7 @@ iflib_device_register(device_t dev, void *sc, if_shared_ctx_t sctx, if_ctx_t *ct ifp = ctx->ifc_ifp; iflib_reset_qvalues(ctx); + IFNET_WLOCK(); CTX_LOCK(ctx); if ((err = IFDI_ATTACH_PRE(ctx)) != 0) { device_printf(dev, "IFDI_ATTACH_PRE failed %d\n", err); @@ -5250,6 +5251,7 @@ iflib_device_register(device_t dev, void *sc, if_shared_ctx_t sctx, if_ctx_t *ct iflib_add_pfil(ctx); ctx->ifc_flags |= IFC_INIT_DONE; CTX_UNLOCK(ctx); + IFNET_WUNLOCK(); return (0); @@ -5265,6 +5267,7 @@ fail_intr_free: iflib_free_intr_mem(ctx); fail_unlock: CTX_UNLOCK(ctx); + IFNET_WUNLOCK(); iflib_deregister(ctx); fail_ctx_free: device_set_softc(ctx->ifc_dev, NULL); |