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![Uwe Kleine-König](/assets/img/avatar_default.png)
The driver core ignores the return value of this callback because there is only little it can do when a device disappears. This is the final bit of a long lasting cleanup quest where several buses were converted to also return void from their remove callback. Additionally some resource leaks were fixed that were caused by drivers returning an error code in the expectation that the driver won't go away. With struct bus_type::remove returning void it's prevented that newly implemented buses return an ignored error code and so don't anticipate wrong expectations for driver authors. Reviewed-by: Tom Rix <trix@redhat.com> (For fpga) Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Cornelia Huck <cohuck@redhat.com> (For drivers/s390 and drivers/vfio) Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> (For ARM, Amba and related parts) Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Chen-Yu Tsai <wens@csie.org> (for sunxi-rsb) Acked-by: Pali Rohár <pali@kernel.org> Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org> (for media) Acked-by: Hans de Goede <hdegoede@redhat.com> (For drivers/platform) Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-By: Vinod Koul <vkoul@kernel.org> Acked-by: Juergen Gross <jgross@suse.com> (For xen) Acked-by: Lee Jones <lee.jones@linaro.org> (For mfd) Acked-by: Johannes Thumshirn <jth@kernel.org> (For mcb) Acked-by: Johan Hovold <johan@kernel.org> Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> (For slimbus) Acked-by: Kirti Wankhede <kwankhede@nvidia.com> (For vfio) Acked-by: Maximilian Luz <luzmaximilian@gmail.com> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> (For ulpi and typec) Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> (For ipack) Acked-by: Geoff Levand <geoff@infradead.org> (For ps3) Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> (For thunderbolt) Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> (For intel_th) Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> (For pcmcia) Acked-by: Rafael J. Wysocki <rafael@kernel.org> (For ACPI) Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> (rpmsg and apr) Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> (For intel-ish-hid) Acked-by: Dan Williams <dan.j.williams@intel.com> (For CXL, DAX, and NVDIMM) Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> (For isa) Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (For firewire) Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> (For hid) Acked-by: Thorsten Scherer <t.scherer@eckelmann.de> (For siox) Acked-by: Sven Van Asbroeck <TheSven73@gmail.com> (For anybuss) Acked-by: Ulf Hansson <ulf.hansson@linaro.org> (For MMC) Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C Acked-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Finn Thain <fthain@linux-m68k.org> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20210713193522.1770306-6-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
311 lines
7.7 KiB
C
311 lines
7.7 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
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* Copyright (C) 2016 T-Platforms. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
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* Copyright (C) 2016 T-Platforms. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copy
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* PCIe NTB Linux driver
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*
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* Contact Information:
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* Allen Hubbe <Allen.Hubbe@emc.com>
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/ntb.h>
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#include <linux/pci.h>
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#define DRIVER_NAME "ntb"
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#define DRIVER_DESCRIPTION "PCIe NTB Driver Framework"
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#define DRIVER_VERSION "1.0"
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#define DRIVER_RELDATE "24 March 2015"
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#define DRIVER_AUTHOR "Allen Hubbe <Allen.Hubbe@emc.com>"
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
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static struct bus_type ntb_bus;
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static void ntb_dev_release(struct device *dev);
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int __ntb_register_client(struct ntb_client *client, struct module *mod,
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const char *mod_name)
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{
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if (!client)
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return -EINVAL;
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if (!ntb_client_ops_is_valid(&client->ops))
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return -EINVAL;
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memset(&client->drv, 0, sizeof(client->drv));
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client->drv.bus = &ntb_bus;
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client->drv.name = mod_name;
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client->drv.owner = mod;
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return driver_register(&client->drv);
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}
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EXPORT_SYMBOL(__ntb_register_client);
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void ntb_unregister_client(struct ntb_client *client)
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{
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driver_unregister(&client->drv);
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}
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EXPORT_SYMBOL(ntb_unregister_client);
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int ntb_register_device(struct ntb_dev *ntb)
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{
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if (!ntb)
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return -EINVAL;
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if (!ntb->pdev)
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return -EINVAL;
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if (!ntb->ops)
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return -EINVAL;
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if (!ntb_dev_ops_is_valid(ntb->ops))
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return -EINVAL;
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init_completion(&ntb->released);
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ntb->dev.bus = &ntb_bus;
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ntb->dev.parent = &ntb->pdev->dev;
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ntb->dev.release = ntb_dev_release;
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dev_set_name(&ntb->dev, "%s", pci_name(ntb->pdev));
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ntb->ctx = NULL;
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ntb->ctx_ops = NULL;
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spin_lock_init(&ntb->ctx_lock);
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return device_register(&ntb->dev);
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}
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EXPORT_SYMBOL(ntb_register_device);
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void ntb_unregister_device(struct ntb_dev *ntb)
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{
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device_unregister(&ntb->dev);
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wait_for_completion(&ntb->released);
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}
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EXPORT_SYMBOL(ntb_unregister_device);
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int ntb_set_ctx(struct ntb_dev *ntb, void *ctx,
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const struct ntb_ctx_ops *ctx_ops)
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{
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unsigned long irqflags;
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if (!ntb_ctx_ops_is_valid(ctx_ops))
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return -EINVAL;
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if (ntb->ctx_ops)
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return -EINVAL;
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spin_lock_irqsave(&ntb->ctx_lock, irqflags);
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{
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ntb->ctx = ctx;
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ntb->ctx_ops = ctx_ops;
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}
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spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
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return 0;
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}
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EXPORT_SYMBOL(ntb_set_ctx);
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void ntb_clear_ctx(struct ntb_dev *ntb)
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{
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unsigned long irqflags;
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spin_lock_irqsave(&ntb->ctx_lock, irqflags);
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{
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ntb->ctx_ops = NULL;
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ntb->ctx = NULL;
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}
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spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
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}
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EXPORT_SYMBOL(ntb_clear_ctx);
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void ntb_link_event(struct ntb_dev *ntb)
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{
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unsigned long irqflags;
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spin_lock_irqsave(&ntb->ctx_lock, irqflags);
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{
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if (ntb->ctx_ops && ntb->ctx_ops->link_event)
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ntb->ctx_ops->link_event(ntb->ctx);
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}
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spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
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}
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EXPORT_SYMBOL(ntb_link_event);
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void ntb_db_event(struct ntb_dev *ntb, int vector)
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{
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unsigned long irqflags;
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spin_lock_irqsave(&ntb->ctx_lock, irqflags);
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{
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if (ntb->ctx_ops && ntb->ctx_ops->db_event)
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ntb->ctx_ops->db_event(ntb->ctx, vector);
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}
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spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
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}
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EXPORT_SYMBOL(ntb_db_event);
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void ntb_msg_event(struct ntb_dev *ntb)
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{
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unsigned long irqflags;
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spin_lock_irqsave(&ntb->ctx_lock, irqflags);
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{
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if (ntb->ctx_ops && ntb->ctx_ops->msg_event)
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ntb->ctx_ops->msg_event(ntb->ctx);
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}
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spin_unlock_irqrestore(&ntb->ctx_lock, irqflags);
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}
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EXPORT_SYMBOL(ntb_msg_event);
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int ntb_default_port_number(struct ntb_dev *ntb)
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{
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switch (ntb->topo) {
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case NTB_TOPO_PRI:
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case NTB_TOPO_B2B_USD:
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return NTB_PORT_PRI_USD;
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case NTB_TOPO_SEC:
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case NTB_TOPO_B2B_DSD:
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return NTB_PORT_SEC_DSD;
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default:
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return 0;
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}
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}
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EXPORT_SYMBOL(ntb_default_port_number);
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int ntb_default_peer_port_count(struct ntb_dev *ntb)
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{
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return NTB_DEF_PEER_CNT;
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}
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EXPORT_SYMBOL(ntb_default_peer_port_count);
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int ntb_default_peer_port_number(struct ntb_dev *ntb, int pidx)
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{
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if (pidx != NTB_DEF_PEER_IDX)
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return -EINVAL;
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switch (ntb->topo) {
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case NTB_TOPO_PRI:
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case NTB_TOPO_B2B_USD:
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return NTB_PORT_SEC_DSD;
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case NTB_TOPO_SEC:
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case NTB_TOPO_B2B_DSD:
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return NTB_PORT_PRI_USD;
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default:
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return 0;
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}
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}
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EXPORT_SYMBOL(ntb_default_peer_port_number);
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int ntb_default_peer_port_idx(struct ntb_dev *ntb, int port)
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{
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int peer_port = ntb_default_peer_port_number(ntb, NTB_DEF_PEER_IDX);
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if (peer_port == -EINVAL || port != peer_port)
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return -EINVAL;
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return 0;
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}
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EXPORT_SYMBOL(ntb_default_peer_port_idx);
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static int ntb_probe(struct device *dev)
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{
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struct ntb_dev *ntb;
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struct ntb_client *client;
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int rc;
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get_device(dev);
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ntb = dev_ntb(dev);
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client = drv_ntb_client(dev->driver);
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rc = client->ops.probe(client, ntb);
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if (rc)
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put_device(dev);
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return rc;
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}
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static void ntb_remove(struct device *dev)
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{
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struct ntb_dev *ntb;
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struct ntb_client *client;
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if (dev->driver) {
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ntb = dev_ntb(dev);
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client = drv_ntb_client(dev->driver);
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client->ops.remove(client, ntb);
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put_device(dev);
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}
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}
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static void ntb_dev_release(struct device *dev)
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{
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struct ntb_dev *ntb = dev_ntb(dev);
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complete(&ntb->released);
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}
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static struct bus_type ntb_bus = {
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.name = "ntb",
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.probe = ntb_probe,
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.remove = ntb_remove,
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};
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static int __init ntb_driver_init(void)
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{
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return bus_register(&ntb_bus);
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}
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module_init(ntb_driver_init);
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static void __exit ntb_driver_exit(void)
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{
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bus_unregister(&ntb_bus);
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}
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module_exit(ntb_driver_exit);
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