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 22BF03B19AB; Sat, 12 Sep 2026 18:46:58 +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=1789238819; cv=none; b=s3GseB9uy/wL9/0R3P/75zldq0j9JXxMgTd3mxhj6VaJWXO9UL8r5FvlWxvvTilMvqjI0616KjQWP8hhBxnMtPpkhrNbwpvEPwpeMWbtauYAhhGAIXzbriZtP0yOhhOMKFf99glgtetcmODGyXo/gwAnjPvwX5NBdUv8P9KLIrM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789238819; c=relaxed/simple; bh=k9CnjSsCagJG80vwsA4YI6Gw4+NtLXBpbKnMwgKLftU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=L9ELnDIYFPtN37BpfhiRSm8sZynZXFh+FNUeIG4XR08p2pdVPzVo3m9ooqcAOFOr50v/8B52yghQFPTXRg20dHVkqJUoEBmsJmnpyUnpuaHbXEwKLBMGMRj6oGtcFbGO6qO+lWi2qOQLxovjcM4FEqRqlkwfbMipdwsTWY+cDKg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=hp/uWtgc; 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="hp/uWtgc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF39E1F000FF; Sat, 12 Sep 2026 18:46:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789238817; bh=JfpUnzDtRFI63X1zTQEhaGbk59pW1MhbIUqWfl6YPsI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hp/uWtgc02iouszwa2fM8hEgvYyTpjM8gOYOZJRFqbn3Y6uRriWfRv8dKGvZ/E3FC BLmPXP/TiXL65jlRPhLsq+pXXO7Sucxov9WP0wQxOEIONiniLibjIZBBGliCEuUkvU qJguC6Bkeq7ihJFO1P3Jfji3KZ1w0wGUwEoelo1Q= 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 5.15 496/935] RDMA/core: Wait for RCU callbacks before unloading ib_core Date: Sat, 12 Sep 2026 08:58:46 +0200 Message-ID: <20260912065538.194469428@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 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 8f987f57a5d62..a3339b710f461 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -2919,6 +2919,7 @@ 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