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 1A1DB2DB788; Thu, 20 Aug 2026 17:37:32 +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=1787247453; cv=none; b=GvfjkF/ROJhnTkPAi4uuzx1T9VNK7r6hYQP83JxZZ/+X8WBuCOwSvKAuhMVxLFrJc1knHwuC1BV6IgQxBGTi4HBOv9JPOg/G9a+zuEbQ4ldXG0XeGi1ywyqg/zrnFXGhOEL01ePem0zNC9mIkrWtwSLY20IV9YX3V3OR1hBzouU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787247453; c=relaxed/simple; bh=ntLKKzhxCGC7CqGa5W0qT704dpfWEW2awHPp56tIVv8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UlLBv3NtmJ3VDIZgYjRGH50QVp81m1L0Xo81Zd9ZCpNt/fWO/fu3AIyFpLBizmdL4x8A2mMfSk//96xRTmRgIxJt4gpg6Agvm2d+7Onwjl8eNwUgBnakuQRrPrqBqGDttPPO+grYVsjGuDfTSBuurSL5zIplGjlPi9wCylYDW7k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UhvqVbog; 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="UhvqVbog" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 776D11F000E9; Thu, 20 Aug 2026 17:37:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787247452; bh=uGcbc5zdlCk8dSvzIvor5AxI3fqAdsiT100LuauSV4Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UhvqVbogufXli7YgrgyAzhN6Uf5ogl9oTua4kMXq1khZUR1XXgxWJWxwzjUWJQMZF mRlbkyBmcVSP8aclkgJVh/32NfKgSTe98TsjeeaAYcJAVdmGMApV698WQ3tf/qQzjv rrp2RrzxNiIk0V3wePZ51YDC1LzLkm9hfoj7fQJk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Matthew Rosato , Eric Farman , Christian Borntraeger Subject: [PATCH 6.6 051/166] s390/vfio_ccw: Cancel existing workqueues Date: Thu, 20 Aug 2026 16:55:10 +0200 Message-ID: <20260820145212.696848558@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820145211.194104353@linuxfoundation.org> References: <20260820145211.194104353@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: Eric Farman commit 79c60b2c61105368dcc8444eb45847e21734f7c4 upstream. The initialization of the io_work and crw_work workqueues begs the question of whether they should be un-initialized. Add the corresponding cleanup tags in _release_dev to ensure work isn't dispatched after the private struct is free'd. Suggested-by: Matthew Rosato Fixes: e5f84dbaea59 ("vfio: ccw: return I/O results asynchronously") Fixes: 3f02cb2fd9d2 ("vfio-ccw: Wire up the CRW irq and CRW region") Cc: stable@vger.kernel.org Reviewed-by: Matthew Rosato Signed-off-by: Eric Farman Signed-off-by: Christian Borntraeger Signed-off-by: Greg Kroah-Hartman --- drivers/s390/cio/vfio_ccw_ops.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -132,6 +132,13 @@ static void vfio_ccw_mdev_release_dev(st container_of(vdev, struct vfio_ccw_private, vdev); struct vfio_ccw_crw *crw, *temp; + /* + * Ensure these work items are fully drained, so none can + * fire after being released. + */ + cancel_work_sync(&private->io_work); + cancel_work_sync(&private->crw_work); + list_for_each_entry_safe(crw, temp, &private->crw, next) { list_del(&crw->next); kfree(crw); @@ -203,6 +210,14 @@ static void vfio_ccw_mdev_close_device(s container_of(vdev, struct vfio_ccw_private, vdev); vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_CLOSE); + + /* + * Ensure these work items are drained, in the event the + * device is re-opened instead of released. + */ + cancel_work_sync(&private->io_work); + cancel_work_sync(&private->crw_work); + vfio_ccw_unregister_dev_regions(private); }