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Revert "drm: protect drm_master pointers in drm_lease.c"

Browse Source 
This reverts commit 34609faad0 which is
commit 56f0729a510f92151682ff6c89f69724d5595d6e upstream and came into
the tree in 5.10.67.

This commit adds some drm functions for a drm driver that is not used
by Android and it breaks the abi, so revert it.

Fixes: faf816b0f8 ("Linux 5.10.67")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I03c28f0b09131c956c9a456b8d8c38e3a13eff5b
This commit is contained in:
Greg Kroah-Hartman
2021-09-20 12:16:55 +02:00
parent 08ed4cb090
commit 49faae8510
4 changed files with 20 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/gpu/drm/drm_auth.c
View File

@@ -376,31 +376,6 @@ struct drm_master *drm_master_get(struct drm_master *master)
}
EXPORT_SYMBOL(drm_master_get);
/**
* drm_file_get_master - reference &drm_file.master of @file_priv
* @file_priv: DRM file private
*
* Increments the reference count of @file_priv's &drm_file.master and returns
* the &drm_file.master. If @file_priv has no &drm_file.master, returns NULL.
*
* Master pointers returned from this function should be unreferenced using
* drm_master_put().
*/
struct drm_master *drm_file_get_master(struct drm_file *file_priv)
{
struct drm_master *master = NULL;
spin_lock(&file_priv->master_lookup_lock);
if (!file_priv->master)
goto unlock;
master = drm_master_get(file_priv->master);
unlock:
spin_unlock(&file_priv->master_lookup_lock);
return master;
}
EXPORT_SYMBOL(drm_file_get_master);
static void drm_master_destroy(struct kref *kref)
{
struct drm_master *master = container_of(kref, struct drm_master, refcount);

81
drivers/gpu/drm/drm_lease.c
View File

@@ -107,19 +107,10 @@ static bool _drm_has_leased(struct drm_master *master, int id)
*/
bool _drm_lease_held(struct drm_file *file_priv, int id)
{
bool ret;
struct drm_master *master;
if (!file_priv)
if (!file_priv || !file_priv->master)
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;
return _drm_lease_held_master(file_priv->master, id);
}
/**
@@ -138,22 +129,13 @@ bool drm_lease_held(struct drm_file *file_priv, int id)
struct drm_master *master;
bool ret;
if (!file_priv)
if (!file_priv || !file_priv->master || !file_priv->master->lessor)
return true;
master = drm_file_get_master(file_priv);
if (!master)
return true;
if (!master->lessor) {
ret = true;
goto out;
}
master = file_priv->master;
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;
}
@@ -173,16 +155,10 @@ uint32_t drm_lease_filter_crtcs(struct drm_file *file_priv, uint32_t crtcs_in)
int count_in, count_out;
uint32_t crtcs_out = 0;
if (!file_priv)
if (!file_priv || !file_priv->master || !file_priv->master->lessor)
return crtcs_in;
master = drm_file_get_master(file_priv);
if (!master)
return crtcs_in;
if (!master->lessor) {
crtcs_out = crtcs_in;
goto out;
}
master = file_priv->master;
dev = master->dev;
count_in = count_out = 0;
@@ -201,9 +177,6 @@ uint32_t drm_lease_filter_crtcs(struct drm_file *file_priv, uint32_t crtcs_in)
count_in++;
}
mutex_unlock(&master->dev->mode_config.idr_mutex);
out:
drm_master_put(&master);
return crtcs_out;
}
@@ -517,7 +490,7 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
size_t object_count;
int ret = 0;
struct idr leases;
struct drm_master *lessor;
struct drm_master *lessor = lessor_priv->master;
struct drm_master *lessee = NULL;
struct file *lessee_file = NULL;
struct file *lessor_file = lessor_priv->filp;
@@ -529,6 +502,12 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
/* Do not allow sub-leases */
if (lessor->lessor) {
DRM_DEBUG_LEASE("recursive leasing not allowed\n");
return -EINVAL;
}
/* need some objects */
if (cl->object_count == 0) {
DRM_DEBUG_LEASE("no objects in lease\n");
@@ -540,22 +519,12 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
return -EINVAL;
}
lessor = drm_file_get_master(lessor_priv);
/* Do not allow sub-leases */
if (lessor->lessor) {
DRM_DEBUG_LEASE("recursive leasing not allowed\n");
ret = -EINVAL;
goto out_lessor;
}
object_count = cl->object_count;
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);
goto out_lessor;
}
if (IS_ERR(object_ids))
return PTR_ERR(object_ids);
idr_init(&leases);
@@ -566,15 +535,14 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
if (ret) {
DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret);
idr_destroy(&leases);
goto out_lessor;
return ret;
}
/* 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;
return fd;
}
DRM_DEBUG_LEASE("Creating lease\n");
@@ -610,7 +578,6 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
/* Hook up the fd */
fd_install(fd, lessee_file);
drm_master_put(&lessor);
DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl succeeded\n");
return 0;
@@ -620,8 +587,6 @@ out_lessee:
out_leases:
put_unused_fd(fd);
out_lessor:
drm_master_put(&lessor);
DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret);
return ret;
}
@@ -644,7 +609,7 @@ int drm_mode_list_lessees_ioctl(struct drm_device *dev,
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;
struct drm_master *lessor = lessor_priv->master, *lessee;
int count;
int ret = 0;
@@ -655,7 +620,6 @@ int drm_mode_list_lessees_ioctl(struct drm_device *dev,
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
lessor = drm_file_get_master(lessor_priv);
DRM_DEBUG_LEASE("List lessees for %d\n", lessor->lessee_id);
mutex_lock(&dev->mode_config.idr_mutex);
@@ -679,7 +643,6 @@ int drm_mode_list_lessees_ioctl(struct drm_device *dev,
arg->count_lessees = count;
mutex_unlock(&dev->mode_config.idr_mutex);
drm_master_put(&lessor);
return ret;
}
@@ -699,7 +662,7 @@ int drm_mode_get_lease_ioctl(struct drm_device *dev,
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 drm_master *lessee = lessee_priv->master;
struct idr *object_idr;
int count;
void *entry;
@@ -713,7 +676,6 @@ int drm_mode_get_lease_ioctl(struct drm_device *dev,
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
lessee = drm_file_get_master(lessee_priv);
DRM_DEBUG_LEASE("get lease for %d\n", lessee->lessee_id);
mutex_lock(&dev->mode_config.idr_mutex);
@@ -741,7 +703,6 @@ int drm_mode_get_lease_ioctl(struct drm_device *dev,
arg->count_objects = count;
mutex_unlock(&dev->mode_config.idr_mutex);
drm_master_put(&lessee);
return ret;
}
@@ -760,7 +721,7 @@ 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 *lessor = lessor_priv->master;
struct drm_master *lessee;
int ret = 0;
@@ -770,7 +731,6 @@ int drm_mode_revoke_lease_ioctl(struct drm_device *dev,
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);
@@ -791,7 +751,6 @@ int drm_mode_revoke_lease_ioctl(struct drm_device *dev,
fail:
mutex_unlock(&dev->mode_config.idr_mutex);
drm_master_put(&lessor);
return ret;
}

1
include/drm/drm_auth.h
View File

@@ -107,7 +107,6 @@ struct drm_master {
};
struct drm_master *drm_master_get(struct drm_master *master);
struct drm_master *drm_file_get_master(struct drm_file *file_priv);
void drm_master_put(struct drm_master **master);
bool drm_is_current_master(struct drm_file *fpriv);

6
include/drm/drm_file.h
View File

@@ -233,12 +233,6 @@ struct drm_file {
* this only matches &drm_device.master if the master is the currently
* active one.
*
* When dereferencing this pointer, either hold struct
* &drm_device.master_mutex for the duration of the pointer's use, or
* use drm_file_get_master() if struct &drm_device.master_mutex is not
* currently held and there is no other need to hold it. This prevents
* @master from being freed during use.
*
* See also @authentication and @is_master and the :ref:`section on
* primary nodes and authentication <drm_primary_node>`.
*/