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0c97ff108f
commit799900f017upstream. Make sure to drop the reference taken when looking up the idxd device as part of the compat bind and unbind sysfs interface. Fixes:6e7f3ee97b("dmaengine: idxd: move dsa_drv support to compatible mode") Cc: stable@vger.kernel.org # 5.15 Cc: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://patch.msgid.link/20251117161258.10679-7-johan@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/device/bus.h>
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#include "idxd.h"
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extern void device_driver_detach(struct device *dev);
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#define DRIVER_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
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struct driver_attribute driver_attr_##_name = \
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__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
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static ssize_t unbind_store(struct device_driver *drv, const char *buf, size_t count)
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{
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const struct bus_type *bus = drv->bus;
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struct device *dev;
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int rc = -ENODEV;
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dev = bus_find_device_by_name(bus, NULL, buf);
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if (!dev)
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return -ENODEV;
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if (dev->driver) {
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device_driver_detach(dev);
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rc = count;
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}
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put_device(dev);
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return rc;
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}
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static DRIVER_ATTR_IGNORE_LOCKDEP(unbind, 0200, NULL, unbind_store);
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static ssize_t bind_store(struct device_driver *drv, const char *buf, size_t count)
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{
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const struct bus_type *bus = drv->bus;
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struct device *dev;
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struct device_driver *alt_drv = NULL;
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int rc = -ENODEV;
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struct idxd_dev *idxd_dev;
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dev = bus_find_device_by_name(bus, NULL, buf);
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if (!dev)
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return -ENODEV;
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if (dev->driver || drv != &dsa_drv.drv)
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goto err_put_dev;
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idxd_dev = confdev_to_idxd_dev(dev);
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if (is_idxd_dev(idxd_dev)) {
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alt_drv = driver_find("idxd", bus);
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} else if (is_idxd_wq_dev(idxd_dev)) {
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struct idxd_wq *wq = confdev_to_wq(dev);
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if (is_idxd_wq_kernel(wq))
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alt_drv = driver_find("dmaengine", bus);
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else if (is_idxd_wq_user(wq))
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alt_drv = driver_find("user", bus);
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}
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if (!alt_drv)
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goto err_put_dev;
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rc = device_driver_attach(alt_drv, dev);
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if (rc < 0)
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goto err_put_dev;
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put_device(dev);
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return count;
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err_put_dev:
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put_device(dev);
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return rc;
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}
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static DRIVER_ATTR_IGNORE_LOCKDEP(bind, 0200, NULL, bind_store);
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static struct attribute *dsa_drv_compat_attrs[] = {
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&driver_attr_bind.attr,
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&driver_attr_unbind.attr,
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NULL,
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};
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static const struct attribute_group dsa_drv_compat_attr_group = {
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.attrs = dsa_drv_compat_attrs,
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};
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static const struct attribute_group *dsa_drv_compat_groups[] = {
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&dsa_drv_compat_attr_group,
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NULL,
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};
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static int idxd_dsa_drv_probe(struct idxd_dev *idxd_dev)
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{
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return -ENODEV;
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}
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static void idxd_dsa_drv_remove(struct idxd_dev *idxd_dev)
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{
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}
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static enum idxd_dev_type dev_types[] = {
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IDXD_DEV_NONE,
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};
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struct idxd_device_driver dsa_drv = {
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.name = "dsa",
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.probe = idxd_dsa_drv_probe,
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.remove = idxd_dsa_drv_remove,
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.type = dev_types,
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.drv = {
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.suppress_bind_attrs = true,
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.groups = dsa_drv_compat_groups,
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},
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};
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module_idxd_driver(dsa_drv);
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MODULE_IMPORT_NS(IDXD);
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