drm: rip out dev->devname

This was only ever used to pretty-print the irq driver name. And on
kms systems due to set_version bonghits we never set up the prettier
name, ever. Which make this a bit pointless.

Also, we can always dig out the driver-instance/irq relationship
through other means, so this isn't that useful. So just rip it out to
simplify the set_version/set_busid insanity a bit.

Also delete the temporary busname from drm_pci_set_busid, it's now
unused.

v2: Rebase on top of the new host1x drm_bus for tegra.
Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_ioctl.c

@@ -72,9 +72,6 @@ static void
 drm_unset_busid(struct drm_device *dev,
 		struct drm_master *master)
 {
-	kfree(dev->devname);
-	dev->devname = NULL;
-
 	kfree(master->unique);
 	master->unique = NULL;
 	master->unique_len = 0;

drivers/gpu/drm/drm_irq.c

@@ -246,7 +246,6 @@ int drm_irq_install(struct drm_device *dev, int irq)
 {
 	int ret;
 	unsigned long sh_flags = 0;
-	char *irqname;
 
 	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 		return -EINVAL;
@@ -272,13 +271,8 @@ int drm_irq_install(struct drm_device *dev, int irq)
 	if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
 		sh_flags = IRQF_SHARED;
 
-	if (dev->devname)
-		irqname = dev->devname;
-	else
-		irqname = dev->driver->name;
-
 	ret = request_irq(irq, dev->driver->irq_handler,
-			  sh_flags, irqname, dev);
+			  sh_flags, dev->driver->name, dev);
 
 	if (ret < 0) {
 		dev->irq_enabled = false;

drivers/gpu/drm/drm_pci.c

@@ -146,7 +146,6 @@ static const char *drm_pci_get_name(struct drm_device *dev)
 static int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
 {
 	int len, ret;
-	struct pci_driver *pdriver = dev->driver->kdriver.pci;
 	master->unique_len = 40;
 	master->unique_size = master->unique_len;
 	master->unique = kmalloc(master->unique_size, GFP_KERNEL);
@@ -168,18 +167,6 @@ static int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
 	} else
 		master->unique_len = len;
 
-	dev->devname =
-		kmalloc(strlen(pdriver->name) +
-			master->unique_len + 2, GFP_KERNEL);
-
-	if (dev->devname == NULL) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	sprintf(dev->devname, "%s@%s", pdriver->name,
-		master->unique);
-
 	return 0;
 err:
 	return ret;
@@ -190,7 +177,6 @@ int drm_pci_set_unique(struct drm_device *dev,
 		       struct drm_unique *u)
 {
 	int domain, bus, slot, func, ret;
-	const char *bus_name;
 
 	master->unique_len = u->unique_len;
 	master->unique_size = u->unique_len + 1;
@@ -207,17 +193,6 @@ int drm_pci_set_unique(struct drm_device *dev,
 
 	master->unique[master->unique_len] = '\0';
 
-	bus_name = dev->driver->bus->get_name(dev);
-	dev->devname = kmalloc(strlen(bus_name) +
-			       strlen(master->unique) + 2, GFP_KERNEL);
-	if (!dev->devname) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	sprintf(dev->devname, "%s@%s", bus_name,
-		master->unique);
-
 	/* Return error if the busid submitted doesn't match the device's actual
 	 * busid.
 	 */

drivers/gpu/drm/drm_platform.c

@@ -101,17 +101,6 @@ static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *mas
 		goto err;
 	}
 
-	dev->devname =
-		kmalloc(strlen(dev->platformdev->name) +
-			master->unique_len + 2, GFP_KERNEL);
-
-	if (dev->devname == NULL) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	sprintf(dev->devname, "%s@%s", dev->platformdev->name,
-		master->unique);
 	return 0;
 err:
 	return ret;

drivers/gpu/drm/drm_stub.c

@@ -166,9 +166,6 @@ static void drm_master_destroy(struct kref *kref)
 		master->unique_len = 0;
 	}
 
-	kfree(dev->devname);
-	dev->devname = NULL;
-
 	list_for_each_entry_safe(pt, next, &master->magicfree, head) {
 		list_del(&pt->head);
 		drm_ht_remove_item(&master->magiclist, &pt->hash_item);
@@ -648,8 +645,6 @@ static void drm_dev_release(struct kref *ref)
 	drm_minor_free(dev, DRM_MINOR_RENDER);
 	drm_minor_free(dev, DRM_MINOR_CONTROL);
 
-	kfree(dev->devname);
-
 	mutex_destroy(&dev->master_mutex);
 	kfree(dev);
 }

drivers/gpu/drm/tegra/bus.c

@@ -12,9 +12,7 @@ static int drm_host1x_set_busid(struct drm_device *dev,
 				struct drm_master *master)
 {
 	const char *device = dev_name(dev->dev);
-	const char *driver = dev->driver->name;
 	const char *bus = dev->dev->bus->name;
-	int length;
 
 	master->unique_len = strlen(bus) + 1 + strlen(device);
 	master->unique_size = master->unique_len;
@@ -25,14 +23,6 @@ static int drm_host1x_set_busid(struct drm_device *dev,
 
 	snprintf(master->unique, master->unique_len + 1, "%s:%s", bus, device);
 
-	length = strlen(driver) + 1 + master->unique_len;
-
-	dev->devname = kmalloc(length + 1, GFP_KERNEL);
-	if (!dev->devname)
-		return -ENOMEM;
-
-	snprintf(dev->devname, length + 1, "%s@%s", driver, master->unique);
-
 	return 0;
 }
 

include/drm/drmP.h

@@ -1048,7 +1048,6 @@ struct drm_vblank_crtc {
  */
 struct drm_device {
 	struct list_head legacy_dev_list;/**< list of devices per driver for stealth attach cleanup */
-	char *devname;			/**< For /proc/interrupts */
 	int if_version;			/**< Highest interface version set */
 
 	/** \name Lifetime Management */