1 files changed, 48 insertions, 23 deletions

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 9b9ff46c2378..76d3d18056dd 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -132,32 +132,57 @@ static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
         struct drm_master *master = file_priv->master;
         int len;
 
-        if (master->unique != NULL)
-                return -EBUSY;
-
-        master->unique_len = 40;
-        master->unique_size = master->unique_len;
-        master->unique = kmalloc(master->unique_size, GFP_KERNEL);
-        if (master->unique == NULL)
-                return -ENOMEM;
+        if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) {
+                master->unique_len = 10 + strlen(dev->platformdev->name);
+                master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
+
+                if (master->unique == NULL)
+                        return -ENOMEM;
+
+                len = snprintf(master->unique, master->unique_len,
+                        "platform:%s", dev->platformdev->name);
+
+                if (len > master->unique_len)
+                        DRM_ERROR("Unique buffer overflowed\n");
+
+                dev->devname =
+                        kmalloc(strlen(dev->platformdev->name) +
+                                master->unique_len + 2, GFP_KERNEL);
+
+                if (dev->devname == NULL)
+                        return -ENOMEM;
+
+                sprintf(dev->devname, "%s@%s", dev->platformdev->name,
+                        master->unique);
+
+        } else {
+                master->unique_len = 40;
+                master->unique_size = master->unique_len;
+                master->unique = kmalloc(master->unique_size, GFP_KERNEL);
+                if (master->unique == NULL)
+                        return -ENOMEM;
+
+                len = snprintf(master->unique, master->unique_len,
+                        "pci:%04x:%02x:%02x.%d",
+                        drm_get_pci_domain(dev),
+                        dev->pdev->bus->number,
+                        PCI_SLOT(dev->pdev->devfn),
+                        PCI_FUNC(dev->pdev->devfn));
+                if (len >= master->unique_len)
+                        DRM_ERROR("buffer overflow");
+                else
+                        master->unique_len = len;
 
-        len = snprintf(master->unique, master->unique_len, "pci:%04x:%02x:%02x.%d",
-                       drm_get_pci_domain(dev),
-                       dev->pdev->bus->number,
-                       PCI_SLOT(dev->pdev->devfn),
-                       PCI_FUNC(dev->pdev->devfn));
-        if (len >= master->unique_len)
-                DRM_ERROR("buffer overflow");
-        else
-                master->unique_len = len;
+                dev->devname =
+                        kmalloc(strlen(dev->driver->pci_driver.name) +
+                                master->unique_len + 2, GFP_KERNEL);
 
-        dev->devname = kmalloc(strlen(dev->driver->pci_driver.name) +
-                               master->unique_len + 2, GFP_KERNEL);
-        if (dev->devname == NULL)
-                return -ENOMEM;
+                if (dev->devname == NULL)
+                        return -ENOMEM;
 
-        sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
-                master->unique);
+                sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
+                        master->unique);
+        }
 
         return 0;
 }