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 6EC4630CD82; Thu, 9 Jul 2026 09:07:12 +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=1783588035; cv=none; b=ZnBI3XxcPUY+EUgkoQ54FEkV6It5IU2Uoqn/tEWl2XW2C3/xeMbBgJJCLqrgLpPDCR/WorvRlJwsKWtvtoJdrdofl3q3vCbDzVjHUCCNbwL+oSz+ilgFW2175/TGQ6wh6QXs9jqQXbSC6SktgIyXGUrrPuKUWuD+Y1tAX01Uln8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783588035; c=relaxed/simple; bh=R8O+gNyxyQ3mFzwYKMnSBrWNskGC33HSzINn7n78du8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=J+8H4snd8Ppg9ToGhRJKtOJ2+9+wSTJH18lpMzNZz0/ppYeahheuWAwkNZ+Q8JuZFBLFjl83atZK86FijIddQtUB1NwrcbnHShakOBfEZgJMP9WUywXQlsImuQYn/XouBMXcFrFo7bWvLxZe6rqtq5D2xe5PLwMq4kE2CnJVjdE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jmgEXgVW; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jmgEXgVW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 846F61F00A3A; Thu, 9 Jul 2026 09:07:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783588031; bh=FnbpN+0s4pl5QfhdDEGmVWpJlqoYMnQ1UMGEML7kqgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jmgEXgVWqpyrAP4Ogm2k+uufJ6TXDR2fII0uiPZkPq4vA0BGYuS4bbjmnaOGjSPSF tBXHWISVlMXP6nWzqqNdZSsytYM7uGMlhTVqltTmIvx9DrpfGX9Q6pLAF2NZOYzjAm 1RJ1Hzvs/euM93PKY/pl+6MAzoTxUMuqcB1wG6BM0TI9sL33BPc7F7E6abt5u/FMSf P49QXzgOlHzzkMjYuIVnks30aAvThRAzuYXLDu/Mb6RSKTeJLhPieJEPl3rloo9n2A PRgwlhEDo4802boZfsa8mJE5yCmhD6oSTA44KOuq9Fmp/vz8X2Ua4AA/h0qqQ4iAhp CW9De6Od+lsgA== From: Leon Romanovsky To: Jason Gunthorpe , Leon Romanovsky Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Sebastian Andrzej Siewior Subject: [PATCH rdma-rc 3/3] RDMA/ipoib: Drain RCU callbacks during module teardown Date: Thu, 9 Jul 2026 12:06:49 +0300 Message-ID: <20260709-unload-rcu-v1-3-fccd27211e5a@nvidia.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260709-unload-rcu-v1-0-fccd27211e5a@nvidia.com> References: <20260709-unload-rcu-v1-0-fccd27211e5a@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.15-dev-18f8f Content-Transfer-Encoding: 8bit From: Leon Romanovsky 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/ Signed-off-by: Leon Romanovsky --- 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 16a015b67206..6c14246befb1 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -2783,6 +2783,7 @@ 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(); @@ -2800,6 +2801,7 @@ 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); -- 2.54.0