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 98F8034CFCA; Sat, 12 Sep 2026 14:29:16 +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=1789223359; cv=none; b=gNY4+B9PQHhOkKCJo2TbuahVX/h1rJjza/h/FCUXsjVG9wMRbNVi3PHJ/j/LFApvdCucOuuYhUpZtxk+oKpgrMuqPlRPoXgYuiPhulbjU+sKs/aeHjXszawBeL/20PQfCkVQrQw0BM1hbyr8lgkknQGMbeu6UNCtoOlts6aWpVc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789223359; c=relaxed/simple; bh=61369FrzgNqpCFygS6ACrO/acq1e8awmFTLsA0w27fc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HFb7pJC349loY2PC3TLEdDmIV2ogx2UR61ZE0TH9zYghujqKyHVzPFarUTZqcZeuMN6ElZAFXVDr0CK0XtlaG0wV0RbGKgNxxqSNRORb2g7ytcqPWwuYAA0N3Un5eRTBMxtUfJ6SM0sRJ+JMTlOnayH0+TVEgBD/M8efxavxiPU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=M5VNkXGT; 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="M5VNkXGT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB1FA1F000FF; Sat, 12 Sep 2026 14:29:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789223356; bh=K9i/BolOpWiseNCC9HGIuY+e07Dx/HHEIMCR2PFyciM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=M5VNkXGTi0saVjIvGLDLiQ4doVZqjruHse4X0OeYXHTRyUuQ4pGSpDRzN4GL7SoN1 dJph/SbzMFLyDm5g005bDBXhewt+E15DzYHgSpAzXIOKziau2OH+Ly2oHSIq/V2qYg QwkNPdCBktjsYPQnxOirh8pHuuVMU0DGdarPlIx0= 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 0720/1424] RDMA/ipoib: Drain RCU callbacks during module teardown Date: Sat, 12 Sep 2026 08:52:32 +0200 Message-ID: <20260912065623.416850355@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 31b7c700670830a0e8a4cdcd451c88a13cc5dc48 ] IPoIB reclamation completions can be signaled from inside an RCU callback. Teardown can wake before the callback returns and unload ib_ipoib while its code is still executing. Client registration failure can also remove already-added devices and queue callbacks. Wait after client and workqueue teardown. Fixes: b63b70d87741 ("IPoIB: Use a private hash table for path lookup in xmit path") 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-v1-3-fccd27211e5a@nvidia.com Acked-by: Sebastian Andrzej Siewior Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/ulp/ipoib/ipoib_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index cf8b0822f5c80..3d44528fc9167 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -2675,6 +2675,7 @@ static int __init ipoib_init_module(void) err_sa: ib_sa_unregister_client(&ipoib_sa_client); destroy_workqueue(ipoib_workqueue); + rcu_barrier(); err_fs: ipoib_unregister_debugfs(); @@ -2692,6 +2693,7 @@ static void __exit ipoib_cleanup_module(void) ib_sa_unregister_client(&ipoib_sa_client); ipoib_unregister_debugfs(); destroy_workqueue(ipoib_workqueue); + rcu_barrier(); } module_init(ipoib_init_module); -- 2.53.0