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 177102F617C; Sat, 12 Sep 2026 18:43:39 +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=1789238620; cv=none; b=ZurYrk7k28JpqU3SUWnISKMF6lXZD2CREZN3TxdqiPz7aijr2zgfqYdBNyI9jlJcvGcH7HwXtdOw6Sk4StEp5OaRE0rrtCgA9X+rhAohcMz7JD28/aM5bFrKfHsTbWHkdUO9NA2NsdhdBqcrIIyFP2KfBXuvcSJnhLPRSX8aq/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789238620; c=relaxed/simple; bh=t864vqcFkuPjuNTIUyzSV9lKczT9NKYCKDtYhaz/Pvo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kwvxKTLKXHytigRXn7nsouIcDUqi1CRuGFDM4US6bUpN6oiEo7nDT5gSSwuNFg1IFuwEB/VWOU7qJay6YgLmfkukkHtdk7BEOef+lFIKaJWUsMN7ODcNRtsJrgBmf5mIvXp19rf1YrFNVxCxCRJ6VJ89t4ozKaH5gZDQ4wBBjvc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MHEmRW6K; 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="MHEmRW6K" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE9881F000FF; Sat, 12 Sep 2026 18:43:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789238619; bh=Znz7tM7q+X8nmtbvOHVlee9ripEPLUYRYY4evxGmzH8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MHEmRW6KVpJY8LxncwMXRayBJdUe3jfwwTfUEB+vC3iafSa1aJYfh0lZW7vHOn+sE CJ0QB783IqslHBVJM/DsX2Oyi/QZBcUEybXmcCl1cYDQTyGc7nucAIerVRE11HPlU6 B5WGpgGACXXjR3abV9HvQrFSYf0zmZKmWj4VUEbs= 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 5.15 500/935] RDMA/ipoib: Drain RCU callbacks during module teardown Date: Sat, 12 Sep 2026 08:58:50 +0200 Message-ID: <20260912065538.287459324@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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 5.15-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 1ea95f8009b82..e956513943c60 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -2672,6 +2672,7 @@ 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(); @@ -2689,6 +2690,7 @@ 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