gpu/drm/drm_ioctl.c

78  *    side-effect this fills out the unique name in the master structure.
79  * 2. Call GET_UNIQUE to read out the unique name from the master structure,
87  *    means the the unique name for the master node just opening is _not_ filled
91  * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
94  *    copypasta from drm 1.0 times where a set unique name meant that the driver
98  * _not_ return a unique string when SET_VERSION hasn't been called yet,
99  * otherwise libdrm breaks. Even when that unique string can't ever change, and
115  * Copies the bus id from drm_device::unique into user space.
125 		if (copy_to_user(u->unique, master->unique, master->unique_len)) {  in drm_getunique()
140 	kfree(master->unique);  in drm_unset_busid()
141 	master->unique = NULL;  in drm_unset_busid()
150 	if (master->unique != NULL)  in drm_set_busid()
160 		WARN_ON(!dev->unique);  in drm_set_busid()
161 		master->unique = kstrdup(dev->unique, GFP_KERNEL);  in drm_set_busid()
162 		if (master->unique)  in drm_set_busid()
163 			master->unique_len = strlen(dev->unique);  in drm_set_busid()