From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3065432B102; Sat, 12 Sep 2026 14:24:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789223097; cv=none; b=T8Adur7hNoFg8krADmJgVk76Geyp1vFCFTfEw53WnuyE3pZe6l8tyD5LEmT0K1z08aZFVmVSAmrJSFpWgKhs3dlnOFMY65ONQqKn4PD7JaA7yOsyilburNr+6NsUq7po9nz/Tb3MdNja0htG1NvNryEYpzj6p2FA9cNIODxEQH0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789223097; c=relaxed/simple; bh=6okdQrm4IfzrA4G9PsPUb6E5Alzs71089EcjraSFTJ8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Kf4goiQB4k6qlofMj6J3mRQE+fVD/avhKfp45+6qa8NgRHmqpu3cE+ipQnSJ6XNIW3/hCAs5hDo0KHAwGwIQgwbkueg0uYWudhcE4rk9Sqst/gX95T2aGSad58NEq7RZzwohFgy/B/NZgtLvfVRFvX+bvT4zxc9hqHRazcVC67c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EZKV/WoB; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="EZKV/WoB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C3941F000FF; Sat, 12 Sep 2026 14:24:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789223096; bh=5ApWRDmlyI9JoIAlIPypNzg+HYeeYDb+cIeF30x5Ono=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=EZKV/WoBoyPrhD+KXP75Mqa23KtMrZKavGSmBQNf+q4CrKx8RPt3YAne4ALmhPs9b Xjq0CM4pBIMinh1Q04kNn/F3OufFGG9ChuWwwLY2jqdEKJpZ+ZN5dBFwUn4QNzbVNK M+1Aftb4mH9nZxm9ARF+W9isao1W4etUxDtlp8+k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sebastian Andrzej Siewior , Leon Romanovsky , Sasha Levin Subject: [PATCH 6.6 0718/1424] RDMA/core: Wait for RCU callbacks before unloading ib_core Date: Sat, 12 Sep 2026 08:52:30 +0200 Message-ID: <20260912065623.373295328@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Leon Romanovsky [ Upstream commit 7d75592114d1664623c8cf191a12b38052c04483 ] put_gid_ndev() is queued with call_rcu() and implemented in ib_core. Stopping the workqueues does not drain callbacks already queued, so RCU could invoke it after the module code has been unloaded. synchronize_rcu() does not wait for callbacks. Wait for them after all producers have stopped. Fixes: 943bd984b108 ("RDMA/core: Allow detaching gid attribute netdevice for RoCE") Reported-by: Sebastian Andrzej Siewior Closes: https://lore.kernel.org/linux-rdma/20260708092316.Qb39F_B0@linutronix.de/ Link: https://patch.msgid.link/20260709-unload-rcu-v1-1-fccd27211e5a@nvidia.com Acked-by: Sebastian Andrzej Siewior Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/core/device.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c index 1a241864b7b54..820ce7bd38075 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -2913,6 +2913,7 @@ static void __exit ib_core_cleanup(void) /* Make sure that any pending umem accounting work is done. */ destroy_workqueue(ib_wq); destroy_workqueue(ib_unreg_wq); + rcu_barrier(); WARN_ON(!xa_empty(&clients)); WARN_ON(!xa_empty(&devices)); } -- 2.53.0