From patchwork Tue Aug 3 10:01:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 12415827 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 D1C69C4338F for ; Tue, 3 Aug 2021 10:04:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC75860F9C for ; Tue, 3 Aug 2021 10:04:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235189AbhHCKET (ORCPT ); Tue, 3 Aug 2021 06:04:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235297AbhHCKED (ORCPT ); Tue, 3 Aug 2021 06:04:03 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CBB99C0617A2 for ; Tue, 3 Aug 2021 03:03:49 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mArFM-0002yH-C3; Tue, 03 Aug 2021 12:02:04 +0200 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1mArFB-0006F1-AC; Tue, 03 Aug 2021 12:01:53 +0200 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1mArFB-0002le-6C; Tue, 03 Aug 2021 12:01:53 +0200 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Bjorn Helgaas Cc: kernel@pengutronix.de, Greg Kroah-Hartman , linux-pci@vger.kernel.org, Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Russell Currey , "Oliver O'Halloran" , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , =?utf-8?b?UmFmYcWCIE1p?= =?utf-8?b?xYJlY2tp?= , Zhou Wang , Herbert Xu , "David S. Miller" , Giovanni Cabiddu , Sathya Prakash , Sreekanth Reddy , Suganath Prabu Subramani , Frederic Barrat , Andrew Donnellan , Arnd Bergmann , Yisen Zhuang , Salil Mehta , Jakub Kicinski , Vadym Kochan , Taras Chornyi , Jiri Pirko , Ido Schimmel , Simon Horman , Konrad Rzeszutek Wilk , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Michael Buesch , Mathias Nyman , Fiona Trahe , Andy Shevchenko , Wojciech Ziemba , Alexander Duyck , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-wireless@vger.kernel.org, linux-crypto@vger.kernel.org, qat-linux@intel.com, MPT-FusionLinux.pdl@broadcom.com, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, oss-drivers@corigine.com, xen-devel@lists.xenproject.org, linux-usb@vger.kernel.org Subject: [PATCH v2 0/6] PCI: Drop duplicated tracking of a pci_dev's bound driver Date: Tue, 3 Aug 2021 12:01:44 +0200 Message-Id: <20210803100150.1543597-1-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, changes since v1 (https://lore.kernel.org/linux-pci/20210729203740.1377045-1-u.kleine-koenig@pengutronix.de): - New patch to simplify drivers/pci/xen-pcifront.c, spotted and suggested by Boris Ostrovsky - Fix a possible NULL pointer dereference I introduced in xen-pcifront.c - A few whitespace improvements - Add a commit log to patch #6 (formerly #5) I also expanded the audience for patches #4 and #6 to allow affected people to actually see the changes to their drivers. Interdiff can be found below. The idea is still the same: After a few cleanups (#1 - #3) a new macro is introduced abstracting access to struct pci_dev->driver. All users are then converted to use this and in the last patch the macro is changed to make use of struct pci_dev::dev->driver to get rid of the duplicated tracking. Best regards Uwe Uwe Kleine-König (6): PCI: Simplify pci_device_remove() PCI: Drop useless check from pci_device_probe() xen/pci: Drop some checks that are always true PCI: Provide wrapper to access a pci_dev's bound driver PCI: Adapt all code locations to not use struct pci_dev::driver directly PCI: Drop duplicated tracking of a pci_dev's bound driver arch/powerpc/include/asm/ppc-pci.h | 3 +- arch/powerpc/kernel/eeh_driver.c | 12 ++-- arch/x86/events/intel/uncore.c | 2 +- arch/x86/kernel/probe_roms.c | 2 +- drivers/bcma/host_pci.c | 6 +- drivers/crypto/hisilicon/qm.c | 2 +- drivers/crypto/qat/qat_common/adf_aer.c | 2 +- drivers/message/fusion/mptbase.c | 4 +- drivers/misc/cxl/guest.c | 21 +++---- drivers/misc/cxl/pci.c | 25 ++++---- .../ethernet/hisilicon/hns3/hns3_ethtool.c | 2 +- .../ethernet/marvell/prestera/prestera_pci.c | 2 +- drivers/net/ethernet/mellanox/mlxsw/pci.c | 2 +- .../ethernet/netronome/nfp/nfp_net_ethtool.c | 2 +- drivers/pci/iov.c | 23 ++++--- drivers/pci/pci-driver.c | 48 +++++++-------- drivers/pci/pci.c | 10 ++-- drivers/pci/pcie/err.c | 35 ++++++----- drivers/pci/xen-pcifront.c | 60 ++++++++----------- drivers/ssb/pcihost_wrapper.c | 7 ++- drivers/usb/host/xhci-pci.c | 3 +- include/linux/pci.h | 2 +- 22 files changed, 145 insertions(+), 130 deletions(-) Range-diff against v1: 1: 7d97605df363 = 1: 8ba6e9faa18c PCI: Simplify pci_device_remove() 2: aec84c688d0f = 2: d8a7dc52091f PCI: Drop useless check from pci_device_probe() -: ------------ > 3: f4b78aa41776 xen/pci: Drop some checks that are always true 3: e6f933f532c9 = 4: 50f3daa64170 PCI: Provide wrapper to access a pci_dev's bound driver 4: d678a2924143 ! 5: 21cbd3f180a1 PCI: Adapt all code locations to not use struct pci_dev::driver directly @@ drivers/message/fusion/mptbase.c: mpt_device_driver_register(struct mpt_pci_driv - id = ioc->pcidev->driver ? - ioc->pcidev->driver->id_table : NULL; + struct pci_driver *pdrv = pci_driver_of_dev(ioc->pcidev); -+ id = pdrv ? pdrv->id_table : NULL; ++ id = pdrv ? pdrv->id_table : NULL; if (dd_cbfunc->probe) dd_cbfunc->probe(ioc->pcidev, id); } @@ drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c: static void hns3_get_drvinfo } - strncpy(drvinfo->driver, h->pdev->driver->name, -- sizeof(drvinfo->driver)); -+ strncpy(drvinfo->driver, pci_driver_of_dev(h->pdev)->name, sizeof(drvinfo->driver)); ++ strncpy(drvinfo->driver, pci_driver_of_dev(h->pdev)->name, + sizeof(drvinfo->driver)); drvinfo->driver[sizeof(drvinfo->driver) - 1] = '\0'; - strncpy(drvinfo->bus_info, pci_name(h->pdev), ## drivers/net/ethernet/marvell/prestera/prestera_pci.c ## @@ drivers/net/ethernet/marvell/prestera/prestera_pci.c: static int prestera_fw_load(struct prestera_fw *fw) @@ drivers/pci/xen-pcifront.c: static pci_ers_result_t pcifront_common_process(int pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn); - if (!pcidev || !pcidev->driver) { -+ pdrv = pci_driver_of_dev(pcidev); -+ if (!pcidev || !pdrv) { ++ if (!pcidev || !(pdrv = pci_driver_of_dev(pcidev))) { dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); pci_dev_put(pcidev); return result; } - pdrv = pcidev->driver; - if (pdrv) { - if (pdrv->err_handler && pdrv->err_handler->error_detected) { + if (pdrv->err_handler && pdrv->err_handler->error_detected) { + pci_dbg(pcidev, "trying to call AER service\n"); ## drivers/ssb/pcihost_wrapper.c ## @@ drivers/ssb/pcihost_wrapper.c: static int ssb_pcihost_probe(struct pci_dev *dev, @@ drivers/ssb/pcihost_wrapper.c: static int ssb_pcihost_probe(struct pci_dev *dev, name = dev_name(&dev->dev); - if (dev->driver && dev->driver->name) - name = dev->driver->name; -+ ++ + pdrv = pci_driver_of_dev(dev); + if (pdrv && pdrv->name) + name = pdrv->name; 5: 8c70ffd24380 ! 6: 02e6da6e5919 PCI: Drop duplicated tracking of a pci_dev's bound driver @@ Metadata ## Commit message ## PCI: Drop duplicated tracking of a pci_dev's bound driver + Currently it's tracked twice which driver is bound to a given pci + device. Now that all users of the pci specific one (struct + pci_dev::driver) are updated to use an access macro + (pci_driver_of_dev()), change the macro to use the information from the + driver core and remove the driver member from struct pci_dev. + Signed-off-by: Uwe Kleine-König ## drivers/pci/pci-driver.c ## base-commit: 2734d6c1b1a089fb593ef6a23d4b70903526fe0c