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Thu, 25 Jun 2026 09:05:36 -0700 (PDT) Date: Thu, 25 Jun 2026 08:48:03 -0700 From: Stanislav Fomichev To: Jakub Kicinski Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, Breno Leitao , joshwash@google.com, hramamurthy@google.com, anthony.l.nguyen@intel.com, przemyslaw.kitszel@intel.com, saeedm@nvidia.com, tariqt@nvidia.com, mbloch@nvidia.com, leon@kernel.org, alexanderduyck@fb.com, kernel-team@meta.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, jordanrhee@google.com, jacob.e.keller@intel.com, nktgrg@google.com, debarghyak@google.com, mohsin.bashr@gmail.com, ernis@linux.microsoft.com, sdf@fomichev.me, gal@nvidia.com, linux-rdma@vger.kernel.org, linux-hyperv@vger.kernel.org Subject: Re: [PATCH net] net: ethtool: keep rtnl_lock for ops using ethtool_op_get_link() Message-ID: References: <20260624190439.2521219-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260624190439.2521219-1-kuba@kernel.org> On 06/24, Jakub Kicinski wrote: > Breno reports following splats on mlx5: > > RTNL: assertion failed at net/core/dev.c (2241) > WARNING: net/core/dev.c:2241 at netif_state_change+0xed/0x130, CPU#5: ethtool/1335 > RIP: 0010:netif_state_change+0xf9/0x130 > Call Trace: > > __linkwatch_sync_dev+0xea/0x120 > ethtool_op_get_link+0xe/0x20 > __ethtool_get_link+0x26/0x40 > linkstate_prepare_data+0x51/0x200 > ethnl_default_doit+0x213/0x470 > genl_family_rcv_msg_doit+0xdd/0x110 > > Looks like I missed ethtool_op_get_link() trying to sync linkwatch, > which needs rtnl_lock. Not all drivers do this - bnxt doesn't, > it just returns the link state, so add an opt-in bit. > > Reported-by: Breno Leitao > Fixes: 45079e00133e ("net: ethtool: optionally skip rtnl_lock on Netlink path for GET ops") > Signed-off-by: Jakub Kicinski Acked-by: Stanislav Fomichev