From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1B75FA3728 for ; Wed, 16 Oct 2019 22:17:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 99677207FF for ; Wed, 16 Oct 2019 22:17:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571264275; bh=l63bBNW4p4Tbl1QgQ/eNqi8H6ikGirXGH3NJnWmRoSs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FG+8ynxgLDu0dH4lr/0hlXW/79XcjaaffxTmowoTOaHHp7tdTV4s1uy301H0eVGXk xgn3eeBRDxqlcpyszJGySW+Cp3toIpi6NrhvxesM971vK/bV2mDKNhUFCL11EAp0qF erDg67BhRYHeFmsP9TMSSARAUkMola939OFhUc7Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389550AbfJPWRy (ORCPT ); Wed, 16 Oct 2019 18:17:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:44722 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2395047AbfJPVyn (ORCPT ); Wed, 16 Oct 2019 17:54:43 -0400 Received: from localhost (unknown [192.55.54.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7A7EA20872; Wed, 16 Oct 2019 21:54:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571262882; bh=l63bBNW4p4Tbl1QgQ/eNqi8H6ikGirXGH3NJnWmRoSs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=snAMcGnNL9c/RWwoJlIF4x8G4p1hZvjd69CWA4CcWBSiH+wpVkfJWsmUM0W4xMmBB CkfXDiTciyjvoNyiCU+sdOfPR37omeGaQ12gp+I2Lbh/qRVEaF9q0am0PJ3akomdOu VUXYmL9SBt75vz2urpDAreCWcoU1HJyyNLPr0zS8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold Subject: [PATCH 4.9 40/92] USB: usb-skeleton: fix runtime PM after driver unbind Date: Wed, 16 Oct 2019 14:50:13 -0700 Message-Id: <20191016214831.753628078@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191016214759.600329427@linuxfoundation.org> References: <20191016214759.600329427@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johan Hovold commit 5c290a5e42c3387e82de86965784d30e6c5270fd upstream. Since commit c2b71462d294 ("USB: core: Fix bug caused by duplicate interface PM usage counter") USB drivers must always balance their runtime PM gets and puts, including when the driver has already been unbound from the interface. Leaving the interface with a positive PM usage counter would prevent a later bound driver from suspending the device. Fixes: c2b71462d294 ("USB: core: Fix bug caused by duplicate interface PM usage counter") Cc: stable Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20191001084908.2003-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/usb-skeleton.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) --- a/drivers/usb/usb-skeleton.c +++ b/drivers/usb/usb-skeleton.c @@ -75,6 +75,7 @@ static void skel_delete(struct kref *kre struct usb_skel *dev = to_skel_dev(kref); usb_free_urb(dev->bulk_in_urb); + usb_put_intf(dev->interface); usb_put_dev(dev->udev); kfree(dev->bulk_in_buffer); kfree(dev); @@ -126,10 +127,7 @@ static int skel_release(struct inode *in return -ENODEV; /* allow the device to be autosuspended */ - mutex_lock(&dev->io_mutex); - if (dev->interface) - usb_autopm_put_interface(dev->interface); - mutex_unlock(&dev->io_mutex); + usb_autopm_put_interface(dev->interface); /* decrement the count on our device */ kref_put(&dev->kref, skel_delete); @@ -509,7 +507,7 @@ static int skel_probe(struct usb_interfa init_waitqueue_head(&dev->bulk_in_wait); dev->udev = usb_get_dev(interface_to_usbdev(interface)); - dev->interface = interface; + dev->interface = usb_get_intf(interface); /* set up the endpoint information */ /* use only the first bulk-in and bulk-out endpoints */