From patchwork Mon Feb 29 17:29:50 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 8456851 Return-Path: X-Original-To: patchwork-tpmdd-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 52D24C0553 for ; Mon, 29 Feb 2016 18:00:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 83A3D20145 for ; Mon, 29 Feb 2016 18:00:54 +0000 (UTC) Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4A23620142 for ; Mon, 29 Feb 2016 18:00:53 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=sfs-ml-2.v29.ch3.sourceforge.com) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1aaS7n-00025F-Oq; Mon, 29 Feb 2016 18:00:51 +0000 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1aaS7m-000253-Kh for tpmdd-devel@lists.sourceforge.net; Mon, 29 Feb 2016 18:00:50 +0000 X-ACL-Warn: Received: from e18.ny.us.ibm.com ([129.33.205.208]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1aaS7l-0007tj-Jc for tpmdd-devel@lists.sourceforge.net; Mon, 29 Feb 2016 18:00:50 +0000 Received: from localhost by e18.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 29 Feb 2016 12:30:05 -0500 X-IBM-Helo: d01dlp03.pok.ibm.com X-IBM-MailFrom: stefanb@linux.vnet.ibm.com X-IBM-RcptTo: tpmdd-devel@lists.sourceforge.net Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by d01dlp03.pok.ibm.com (Postfix) with ESMTP id C9214C90043 for ; Mon, 29 Feb 2016 12:30:01 -0500 (EST) Received: from d01av03.pok.ibm.com (d01av03.pok.ibm.com [9.56.224.217]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u1THU4Lj31719480 for ; Mon, 29 Feb 2016 17:30:04 GMT Received: from d01av03.pok.ibm.com (localhost [127.0.0.1]) by d01av03.pok.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u1THU35T013078 for ; Mon, 29 Feb 2016 12:30:03 -0500 Received: from dhcp-9-2-140-43.watson.ibm.com (dhcp-9-2-140-28.watson.ibm.com [9.2.140.28]) by d01av03.pok.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u1THU0B5012420; Mon, 29 Feb 2016 12:30:02 -0500 From: Stefan Berger To: tpmdd-devel@lists.sourceforge.net Date: Mon, 29 Feb 2016 12:29:50 -0500 Message-Id: <1456766996-9300-5-git-send-email-stefanb@linux.vnet.ibm.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1456766996-9300-1-git-send-email-stefanb@linux.vnet.ibm.com> References: <1456766996-9300-1-git-send-email-stefanb@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16022917-0045-0000-0000-0000037553DE X-Spam-Score: -0.0 (/) X-Headers-End: 1aaS7l-0007tj-Jc Subject: [tpmdd-devel] [PATCH v4 04/10] tpm: Get rid of module locking X-BeenThere: tpmdd-devel@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Tpm Device Driver maintainance List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: tpmdd-devel-bounces@lists.sourceforge.net X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, HK_RANDOM_ENVFROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Now that the tpm core has strong locking around 'ops' it is possible to remove a TPM driver, module and all, even while user space still has things like /dev/tpmX open. For consistency and simplicity, drop the module locking entirely. Signed-off-by: Stefan Berger Reviewed-by: Jason Gunthorpe --- drivers/char/tpm/tpm-chip.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 1ae30f2..8f4b5f2 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -57,9 +57,6 @@ int tpm_try_get_ops(struct tpm_chip *chip) if (!chip->ops) goto out_lock; - if (!try_module_get(chip->dev.parent->driver->owner)) - goto out_lock; - return 0; out_lock: up_read(&chip->ops_sem); @@ -77,7 +74,6 @@ EXPORT_SYMBOL_GPL(tpm_try_get_ops); */ void tpm_put_ops(struct tpm_chip *chip) { - module_put(chip->dev.parent->driver->owner); up_read(&chip->ops_sem); put_device(&chip->dev); } @@ -183,7 +179,7 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev, goto out; cdev_init(&chip->cdev, &tpm_fops); - chip->cdev.owner = dev->driver->owner; + chip->cdev.owner = THIS_MODULE; chip->cdev.kobj.parent = &chip->dev.kobj; rc = devm_add_action(dev, (void (*)(void *)) put_device, &chip->dev);