| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright © 2017 Keith Packard <keithp@keithp.com> |
| */ |
| #include <linux/file.h> |
| #include <linux/uaccess.h> |
| |
| #include <drm/drm_auth.h> |
| #include <drm/drm_crtc.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_file.h> |
| #include <drm/drm_lease.h> |
| #include <drm/drm_print.h> |
| |
| #include "drm_crtc_internal.h" |
| #include "drm_internal.h" |
| |
| /** |
| * DOC: drm leasing |
| * |
| * DRM leases provide information about whether a DRM master may control a DRM |
| * mode setting object. This enables the creation of multiple DRM masters that |
| * manage subsets of display resources. |
| * |
| * The original DRM master of a device 'owns' the available drm resources. It |
| * may create additional DRM masters and 'lease' resources which it controls |
| * to the new DRM master. This gives the new DRM master control over the |
| * leased resources until the owner revokes the lease, or the new DRM master |
| * is closed. Some helpful terminology: |
| * |
| * - An 'owner' is a &struct drm_master that is not leasing objects from |
| * another &struct drm_master, and hence 'owns' the objects. The owner can be |
| * identified as the &struct drm_master for which &drm_master.lessor is NULL. |
| * |
| * - A 'lessor' is a &struct drm_master which is leasing objects to one or more |
| * other &struct drm_master. Currently, lessees are not allowed to |
| * create sub-leases, hence the lessor is the same as the owner. |
| * |
| * - A 'lessee' is a &struct drm_master which is leasing objects from some |
| * other &struct drm_master. Each lessee only leases resources from a single |
| * lessor recorded in &drm_master.lessor, and holds the set of objects that |
| * it is leasing in &drm_master.leases. |
| * |
| * - A 'lease' is a contract between the lessor and lessee that identifies |
| * which resources may be controlled by the lessee. All of the resources |
| * that are leased must be owned by or leased to the lessor, and lessors are |
| * not permitted to lease the same object to multiple lessees. |
| * |
| * The set of objects any &struct drm_master 'controls' is limited to the set |
| * of objects it leases (for lessees) or all objects (for owners). |
| * |
| * Objects not controlled by a &struct drm_master cannot be modified through |
| * the various state manipulating ioctls, and any state reported back to user |
| * space will be edited to make them appear idle and/or unusable. For |
| * instance, connectors always report 'disconnected', while encoders |
| * report no possible crtcs or clones. |
| * |
| * Since each lessee may lease objects from a single lessor, display resource |
| * leases form a tree of &struct drm_master. As lessees are currently not |
| * allowed to create sub-leases, the tree depth is limited to 1. All of |
| * these get activated simultaneously when the top level device owner changes |
| * through the SETMASTER or DROPMASTER IOCTL, so &drm_device.master points to |
| * the owner at the top of the lease tree (i.e. the &struct drm_master for which |
| * &drm_master.lessor is NULL). The full list of lessees that are leasing |
| * objects from the owner can be searched via the owner's |
| * &drm_master.lessee_idr. |
| */ |
| |
| #define drm_for_each_lessee(lessee, lessor) \ |
| list_for_each_entry((lessee), &(lessor)->lessees, lessee_list) |
| |
| static uint64_t drm_lease_idr_object; |
| |
| struct drm_master *drm_lease_owner(struct drm_master *master) |
| { |
| while (master->lessor != NULL) |
| master = master->lessor; |
| return master; |
| } |
| |
| static struct drm_master* |
| _drm_find_lessee(struct drm_master *master, int lessee_id) |
| { |
| lockdep_assert_held(&master->dev->mode_config.idr_mutex); |
| return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id); |
| } |
| |
| static int _drm_lease_held_master(struct drm_master *master, int id) |
| { |
| lockdep_assert_held(&master->dev->mode_config.idr_mutex); |
| if (master->lessor) |
| return idr_find(&master->leases, id) != NULL; |
| return true; |
| } |
| |
| /* Checks if the given object has been leased to some lessee of drm_master */ |
| static bool _drm_has_leased(struct drm_master *master, int id) |
| { |
| struct drm_master *lessee; |
| |
| lockdep_assert_held(&master->dev->mode_config.idr_mutex); |
| drm_for_each_lessee(lessee, master) |
| if (_drm_lease_held_master(lessee, id)) |
| return true; |
| return false; |
| } |
| |
| /* Called with idr_mutex held */ |
| bool _drm_lease_held(struct drm_file *file_priv, int id) |
| { |
| bool ret; |
| struct drm_master *master; |
| |
| if (!file_priv) |
| return true; |
| |
| master = drm_file_get_master(file_priv); |
| if (!master) |
| return true; |
| ret = _drm_lease_held_master(master, id); |
| drm_master_put(&master); |
| |
| return ret; |
| } |
| |
| bool drm_lease_held(struct drm_file *file_priv, int id) |
| { |
| struct drm_master *master; |
| bool ret; |
| |
| if (!file_priv) |
| return true; |
| |
| master = drm_file_get_master(file_priv); |
| if (!master) |
| return true; |
| if (!master->lessor) { |
| ret = true; |
| goto out; |
| } |
| mutex_lock(&master->dev->mode_config.idr_mutex); |
| ret = _drm_lease_held_master(master, id); |
| mutex_unlock(&master->dev->mode_config.idr_mutex); |
| |
| out: |
| drm_master_put(&master); |
| return ret; |
| } |
| |
| /* |
| * Given a bitmask of crtcs to check, reconstructs a crtc mask based on the |
| * crtcs which are visible through the specified file. |
| */ |
| uint32_t drm_lease_filter_crtcs(struct drm_file *file_priv, uint32_t crtcs_in) |
| { |
| struct drm_master *master; |
| struct drm_device *dev; |
| struct drm_crtc *crtc; |
| int count_in, count_out; |
| uint32_t crtcs_out = 0; |
| |
| if (!file_priv) |
| return crtcs_in; |
| |
| master = drm_file_get_master(file_priv); |
| if (!master) |
| return crtcs_in; |
| if (!master->lessor) { |
| crtcs_out = crtcs_in; |
| goto out; |
| } |
| dev = master->dev; |
| |
| count_in = count_out = 0; |
| mutex_lock(&master->dev->mode_config.idr_mutex); |
| list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { |
| if (_drm_lease_held_master(master, crtc->base.id)) { |
| uint32_t mask_in = 1ul << count_in; |
| |
| if ((crtcs_in & mask_in) != 0) { |
| uint32_t mask_out = 1ul << count_out; |
| |
| crtcs_out |= mask_out; |
| } |
| count_out++; |
| } |
| count_in++; |
| } |
| mutex_unlock(&master->dev->mode_config.idr_mutex); |
| |
| out: |
| drm_master_put(&master); |
| return crtcs_out; |
| } |
| |
| /* |
| * Uses drm_master_create to allocate a new drm_master, then checks to |
| * make sure all of the desired objects can be leased, atomically |
| * leasing them to the new drmmaster. |
| * |
| * ERR_PTR(-EACCES) some other master holds the title to any object |
| * ERR_PTR(-ENOENT) some object is not a valid DRM object for this device |
| * ERR_PTR(-EBUSY) some other lessee holds title to this object |
| * ERR_PTR(-EEXIST) same object specified more than once in the provided list |
| * ERR_PTR(-ENOMEM) allocation failed |
| */ |
| static struct drm_master *drm_lease_create(struct drm_master *lessor, struct idr *leases) |
| { |
| struct drm_device *dev = lessor->dev; |
| int error; |
| struct drm_master *lessee; |
| int object; |
| int id; |
| void *entry; |
| |
| drm_dbg_lease(dev, "lessor %d\n", lessor->lessee_id); |
| |
| lessee = drm_master_create(lessor->dev); |
| if (!lessee) { |
| drm_dbg_lease(dev, "drm_master_create failed\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| mutex_lock(&dev->mode_config.idr_mutex); |
| |
| idr_for_each_entry(leases, entry, object) { |
| error = 0; |
| if (!idr_find(&dev->mode_config.object_idr, object)) |
| error = -ENOENT; |
| else if (_drm_has_leased(lessor, object)) |
| error = -EBUSY; |
| |
| if (error != 0) { |
| drm_dbg_lease(dev, "object %d failed %d\n", object, error); |
| goto out_lessee; |
| } |
| } |
| |
| /* Insert the new lessee into the tree */ |
| id = idr_alloc(&(drm_lease_owner(lessor)->lessee_idr), lessee, 1, 0, GFP_KERNEL); |
| if (id < 0) { |
| error = id; |
| goto out_lessee; |
| } |
| |
| lessee->lessee_id = id; |
| lessee->lessor = drm_master_get(lessor); |
| list_add_tail(&lessee->lessee_list, &lessor->lessees); |
| |
| /* Move the leases over */ |
| lessee->leases = *leases; |
| drm_dbg_lease(dev, "new lessee %d %p, lessor %d %p\n", |
| lessee->lessee_id, lessee, lessor->lessee_id, lessor); |
| |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| return lessee; |
| |
| out_lessee: |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| |
| drm_master_put(&lessee); |
| |
| return ERR_PTR(error); |
| } |
| |
| void drm_lease_destroy(struct drm_master *master) |
| { |
| struct drm_device *dev = master->dev; |
| |
| mutex_lock(&dev->mode_config.idr_mutex); |
| |
| drm_dbg_lease(dev, "drm_lease_destroy %d\n", master->lessee_id); |
| |
| /* This master is referenced by all lessees, hence it cannot be destroyed |
| * until all of them have been |
| */ |
| WARN_ON(!list_empty(&master->lessees)); |
| |
| /* Remove this master from the lessee idr in the owner */ |
| if (master->lessee_id != 0) { |
| drm_dbg_lease(dev, "remove master %d from device list of lessees\n", |
| master->lessee_id); |
| idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id); |
| } |
| |
| /* Remove this master from any lessee list it may be on */ |
| list_del(&master->lessee_list); |
| |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| |
| if (master->lessor) { |
| /* Tell the master to check the lessee list */ |
| drm_sysfs_lease_event(dev); |
| drm_master_put(&master->lessor); |
| } |
| |
| drm_dbg_lease(dev, "drm_lease_destroy done %d\n", master->lessee_id); |
| } |
| |
| static void _drm_lease_revoke(struct drm_master *top) |
| { |
| int object; |
| void *entry; |
| struct drm_master *master = top; |
| |
| lockdep_assert_held(&top->dev->mode_config.idr_mutex); |
| |
| /* |
| * Walk the tree starting at 'top' emptying all leases. Because |
| * the tree is fully connected, we can do this without recursing |
| */ |
| for (;;) { |
| drm_dbg_lease(master->dev, "revoke leases for %p %d\n", |
| master, master->lessee_id); |
| |
| /* Evacuate the lease */ |
| idr_for_each_entry(&master->leases, entry, object) |
| idr_remove(&master->leases, object); |
| |
| /* Depth-first list walk */ |
| |
| /* Down */ |
| if (!list_empty(&master->lessees)) { |
| master = list_first_entry(&master->lessees, struct drm_master, lessee_list); |
| } else { |
| /* Up */ |
| while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, lessee_list)) |
| master = master->lessor; |
| |
| if (master == top) |
| break; |
| |
| /* Over */ |
| master = list_next_entry(master, lessee_list); |
| } |
| } |
| } |
| |
| void drm_lease_revoke(struct drm_master *top) |
| { |
| mutex_lock(&top->dev->mode_config.idr_mutex); |
| _drm_lease_revoke(top); |
| mutex_unlock(&top->dev->mode_config.idr_mutex); |
| } |
| |
| static int validate_lease(struct drm_device *dev, |
| int object_count, |
| struct drm_mode_object **objects, |
| bool universal_planes) |
| { |
| int o; |
| int has_crtc = -1; |
| int has_connector = -1; |
| int has_plane = -1; |
| |
| /* we want to confirm that there is at least one crtc, plane |
| connector object. */ |
| |
| for (o = 0; o < object_count; o++) { |
| if (objects[o]->type == DRM_MODE_OBJECT_CRTC && has_crtc == -1) { |
| has_crtc = o; |
| } |
| if (objects[o]->type == DRM_MODE_OBJECT_CONNECTOR && has_connector == -1) |
| has_connector = o; |
| |
| if (universal_planes) { |
| if (objects[o]->type == DRM_MODE_OBJECT_PLANE && has_plane == -1) |
| has_plane = o; |
| } |
| } |
| if (has_crtc == -1 || has_connector == -1) |
| return -EINVAL; |
| if (universal_planes && has_plane == -1) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static int fill_object_idr(struct drm_device *dev, |
| struct drm_file *lessor_priv, |
| struct idr *leases, |
| int object_count, |
| u32 *object_ids) |
| { |
| struct drm_mode_object **objects; |
| u32 o; |
| int ret; |
| bool universal_planes = READ_ONCE(lessor_priv->universal_planes); |
| |
| objects = kcalloc(object_count, sizeof(struct drm_mode_object *), |
| GFP_KERNEL); |
| if (!objects) |
| return -ENOMEM; |
| |
| /* step one - get references to all the mode objects |
| and check for validity. */ |
| for (o = 0; o < object_count; o++) { |
| objects[o] = drm_mode_object_find(dev, lessor_priv, |
| object_ids[o], |
| DRM_MODE_OBJECT_ANY); |
| if (!objects[o]) { |
| ret = -ENOENT; |
| goto out_free_objects; |
| } |
| |
| if (!drm_mode_object_lease_required(objects[o]->type)) { |
| DRM_DEBUG_KMS("invalid object for lease\n"); |
| ret = -EINVAL; |
| goto out_free_objects; |
| } |
| } |
| |
| ret = validate_lease(dev, object_count, objects, universal_planes); |
| if (ret) { |
| drm_dbg_lease(dev, "lease validation failed\n"); |
| goto out_free_objects; |
| } |
| |
| /* add their IDs to the lease request - taking into account |
| universal planes */ |
| for (o = 0; o < object_count; o++) { |
| struct drm_mode_object *obj = objects[o]; |
| u32 object_id = objects[o]->id; |
| |
| drm_dbg_lease(dev, "Adding object %d to lease\n", object_id); |
| |
| /* |
| * We're using an IDR to hold the set of leased |
| * objects, but we don't need to point at the object's |
| * data structure from the lease as the main object_idr |
| * will be used to actually find that. Instead, all we |
| * really want is a 'leased/not-leased' result, for |
| * which any non-NULL pointer will work fine. |
| */ |
| ret = idr_alloc(leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL); |
| if (ret < 0) { |
| drm_dbg_lease(dev, "Object %d cannot be inserted into leases (%d)\n", |
| object_id, ret); |
| goto out_free_objects; |
| } |
| if (obj->type == DRM_MODE_OBJECT_CRTC && !universal_planes) { |
| struct drm_crtc *crtc = obj_to_crtc(obj); |
| |
| ret = idr_alloc(leases, &drm_lease_idr_object, crtc->primary->base.id, crtc->primary->base.id + 1, GFP_KERNEL); |
| if (ret < 0) { |
| drm_dbg_lease(dev, "Object primary plane %d cannot be inserted into leases (%d)\n", |
| object_id, ret); |
| goto out_free_objects; |
| } |
| if (crtc->cursor) { |
| ret = idr_alloc(leases, &drm_lease_idr_object, crtc->cursor->base.id, crtc->cursor->base.id + 1, GFP_KERNEL); |
| if (ret < 0) { |
| drm_dbg_lease(dev, "Object cursor plane %d cannot be inserted into leases (%d)\n", |
| object_id, ret); |
| goto out_free_objects; |
| } |
| } |
| } |
| } |
| |
| ret = 0; |
| out_free_objects: |
| for (o = 0; o < object_count; o++) { |
| if (objects[o]) |
| drm_mode_object_put(objects[o]); |
| } |
| kfree(objects); |
| return ret; |
| } |
| |
| /* |
| * The master associated with the specified file will have a lease |
| * created containing the objects specified in the ioctl structure. |
| * A file descriptor will be allocated for that and returned to the |
| * application. |
| */ |
| int drm_mode_create_lease_ioctl(struct drm_device *dev, |
| void *data, struct drm_file *lessor_priv) |
| { |
| struct drm_mode_create_lease *cl = data; |
| size_t object_count; |
| int ret = 0; |
| struct idr leases; |
| struct drm_master *lessor; |
| struct drm_master *lessee = NULL; |
| struct file *lessee_file = NULL; |
| struct file *lessor_file = lessor_priv->filp; |
| struct drm_file *lessee_priv; |
| int fd = -1; |
| uint32_t *object_ids; |
| |
| /* Can't lease without MODESET */ |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return -EOPNOTSUPP; |
| |
| if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) { |
| drm_dbg_lease(dev, "invalid flags\n"); |
| return -EINVAL; |
| } |
| |
| lessor = drm_file_get_master(lessor_priv); |
| /* Do not allow sub-leases */ |
| if (lessor->lessor) { |
| drm_dbg_lease(dev, "recursive leasing not allowed\n"); |
| ret = -EINVAL; |
| goto out_lessor; |
| } |
| |
| object_count = cl->object_count; |
| |
| /* Handle leased objects, if any */ |
| idr_init(&leases); |
| if (object_count != 0) { |
| object_ids = memdup_user(u64_to_user_ptr(cl->object_ids), |
| array_size(object_count, sizeof(__u32))); |
| if (IS_ERR(object_ids)) { |
| ret = PTR_ERR(object_ids); |
| idr_destroy(&leases); |
| goto out_lessor; |
| } |
| |
| /* fill and validate the object idr */ |
| ret = fill_object_idr(dev, lessor_priv, &leases, |
| object_count, object_ids); |
| kfree(object_ids); |
| if (ret) { |
| drm_dbg_lease(dev, "lease object lookup failed: %i\n", ret); |
| idr_destroy(&leases); |
| goto out_lessor; |
| } |
| } |
| |
| /* Allocate a file descriptor for the lease */ |
| fd = get_unused_fd_flags(cl->flags & (O_CLOEXEC | O_NONBLOCK)); |
| if (fd < 0) { |
| idr_destroy(&leases); |
| ret = fd; |
| goto out_lessor; |
| } |
| |
| drm_dbg_lease(dev, "Creating lease\n"); |
| /* lessee will take the ownership of leases */ |
| lessee = drm_lease_create(lessor, &leases); |
| |
| if (IS_ERR(lessee)) { |
| ret = PTR_ERR(lessee); |
| idr_destroy(&leases); |
| goto out_leases; |
| } |
| |
| /* Clone the lessor file to create a new file for us */ |
| drm_dbg_lease(dev, "Allocating lease file\n"); |
| lessee_file = file_clone_open(lessor_file); |
| if (IS_ERR(lessee_file)) { |
| ret = PTR_ERR(lessee_file); |
| goto out_lessee; |
| } |
| |
| lessee_priv = lessee_file->private_data; |
| /* Change the file to a master one */ |
| drm_master_put(&lessee_priv->master); |
| lessee_priv->master = lessee; |
| lessee_priv->is_master = 1; |
| lessee_priv->authenticated = 1; |
| |
| /* Pass fd back to userspace */ |
| drm_dbg_lease(dev, "Returning fd %d id %d\n", fd, lessee->lessee_id); |
| cl->fd = fd; |
| cl->lessee_id = lessee->lessee_id; |
| |
| /* Hook up the fd */ |
| fd_install(fd, lessee_file); |
| |
| drm_master_put(&lessor); |
| drm_dbg_lease(dev, "drm_mode_create_lease_ioctl succeeded\n"); |
| return 0; |
| |
| out_lessee: |
| drm_master_put(&lessee); |
| |
| out_leases: |
| put_unused_fd(fd); |
| |
| out_lessor: |
| drm_master_put(&lessor); |
| drm_dbg_lease(dev, "drm_mode_create_lease_ioctl failed: %d\n", ret); |
| return ret; |
| } |
| |
| int drm_mode_list_lessees_ioctl(struct drm_device *dev, |
| void *data, struct drm_file *lessor_priv) |
| { |
| struct drm_mode_list_lessees *arg = data; |
| __u32 __user *lessee_ids = (__u32 __user *) (uintptr_t) (arg->lessees_ptr); |
| __u32 count_lessees = arg->count_lessees; |
| struct drm_master *lessor, *lessee; |
| int count; |
| int ret = 0; |
| |
| if (arg->pad) |
| return -EINVAL; |
| |
| /* Can't lease without MODESET */ |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return -EOPNOTSUPP; |
| |
| lessor = drm_file_get_master(lessor_priv); |
| drm_dbg_lease(dev, "List lessees for %d\n", lessor->lessee_id); |
| |
| mutex_lock(&dev->mode_config.idr_mutex); |
| |
| count = 0; |
| drm_for_each_lessee(lessee, lessor) { |
| /* Only list un-revoked leases */ |
| if (!idr_is_empty(&lessee->leases)) { |
| if (count_lessees > count) { |
| drm_dbg_lease(dev, "Add lessee %d\n", |
| lessee->lessee_id); |
| ret = put_user(lessee->lessee_id, lessee_ids + count); |
| if (ret) |
| break; |
| } |
| count++; |
| } |
| } |
| |
| drm_dbg_lease(dev, "Lessor leases to %d\n", count); |
| if (ret == 0) |
| arg->count_lessees = count; |
| |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| drm_master_put(&lessor); |
| |
| return ret; |
| } |
| |
| /* Return the list of leased objects for the specified lessee */ |
| int drm_mode_get_lease_ioctl(struct drm_device *dev, |
| void *data, struct drm_file *lessee_priv) |
| { |
| struct drm_mode_get_lease *arg = data; |
| __u32 __user *object_ids = (__u32 __user *) (uintptr_t) (arg->objects_ptr); |
| __u32 count_objects = arg->count_objects; |
| struct drm_master *lessee; |
| struct idr *object_idr; |
| int count; |
| void *entry; |
| int object; |
| int ret = 0; |
| |
| if (arg->pad) |
| return -EINVAL; |
| |
| /* Can't lease without MODESET */ |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return -EOPNOTSUPP; |
| |
| lessee = drm_file_get_master(lessee_priv); |
| drm_dbg_lease(dev, "get lease for %d\n", lessee->lessee_id); |
| |
| mutex_lock(&dev->mode_config.idr_mutex); |
| |
| if (lessee->lessor == NULL) |
| /* owner can use all objects */ |
| object_idr = &lessee->dev->mode_config.object_idr; |
| else |
| /* lessee can only use allowed object */ |
| object_idr = &lessee->leases; |
| |
| count = 0; |
| idr_for_each_entry(object_idr, entry, object) { |
| if (count_objects > count) { |
| drm_dbg_lease(dev, "adding object %d\n", object); |
| ret = put_user(object, object_ids + count); |
| if (ret) |
| break; |
| } |
| count++; |
| } |
| |
| DRM_DEBUG("lease holds %d objects\n", count); |
| if (ret == 0) |
| arg->count_objects = count; |
| |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| drm_master_put(&lessee); |
| |
| return ret; |
| } |
| |
| /* |
| * This removes all of the objects from the lease without |
| * actually getting rid of the lease itself; that way all |
| * references to it still work correctly |
| */ |
| int drm_mode_revoke_lease_ioctl(struct drm_device *dev, |
| void *data, struct drm_file *lessor_priv) |
| { |
| struct drm_mode_revoke_lease *arg = data; |
| struct drm_master *lessor; |
| struct drm_master *lessee; |
| int ret = 0; |
| |
| drm_dbg_lease(dev, "revoke lease for %d\n", arg->lessee_id); |
| |
| /* Can't lease without MODESET */ |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return -EOPNOTSUPP; |
| |
| lessor = drm_file_get_master(lessor_priv); |
| mutex_lock(&dev->mode_config.idr_mutex); |
| |
| lessee = _drm_find_lessee(lessor, arg->lessee_id); |
| |
| /* No such lessee */ |
| if (!lessee) { |
| ret = -ENOENT; |
| goto fail; |
| } |
| |
| /* Lease is not held by lessor */ |
| if (lessee->lessor != lessor) { |
| ret = -EACCES; |
| goto fail; |
| } |
| |
| _drm_lease_revoke(lessee); |
| |
| fail: |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| drm_master_put(&lessor); |
| |
| return ret; |
| } |