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;
 }