13 files changed, 72 insertions, 122 deletions

diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
index e3a7a5078e5c..42d2ffa08716 100644
--- a/drivers/gpu/drm/armada/armada_crtc.c
+++ b/drivers/gpu/drm/armada/armada_crtc.c
@@ -653,10 +653,6 @@ static int armada_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
         return 0;
 }
 
-static void armada_drm_crtc_load_lut(struct drm_crtc *crtc)
-{
-}
-
 /* The mode_config.mutex will be held for this call */
 static void armada_drm_crtc_disable(struct drm_crtc *crtc)
 {
@@ -678,7 +674,6 @@ static const struct drm_crtc_helper_funcs armada_crtc_helper_funcs = {
         .mode_fixup     = armada_drm_crtc_mode_fixup,
         .mode_set       = armada_drm_crtc_mode_set,
         .mode_set_base  = armada_drm_crtc_mode_set_base,
-        .load_lut       = armada_drm_crtc_load_lut,
         .disable        = armada_drm_crtc_disable,
 };
 
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 85f0f8cf1fb8..26bcd03a8cb6 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -18,10 +18,6 @@ MODULE_PARM_DESC(defy, "default y resolution");
 
 /* ---------------------------------------------------------------------- */
 
-static void bochs_crtc_load_lut(struct drm_crtc *crtc)
-{
-}
-
 static void bochs_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
         switch (mode) {
@@ -144,7 +140,6 @@ static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
         .mode_set_base = bochs_crtc_mode_set_base,
         .prepare = bochs_crtc_prepare,
         .commit = bochs_crtc_commit,
-        .load_lut = bochs_crtc_load_lut,
 };
 
 static void bochs_crtc_init(struct drm_device *dev)
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index a6b690626a6b..9a62d7a53553 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -32,6 +32,7 @@
 #include <drm/drmP.h>
 
 #if defined(CONFIG_X86)
+#include <asm/smp.h>
 
 /*
  * clflushopt is an unordered instruction which needs fencing with mfence or
@@ -64,12 +65,6 @@ static void drm_cache_flush_clflush(struct page *pages[],
                 drm_clflush_page(*pages++);
         mb();
 }
-
-static void
-drm_clflush_ipi_handler(void *null)
-{
-        wbinvd();
-}
 #endif
 
 void
@@ -82,7 +77,7 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
                 return;
         }
 
-        if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
+        if (wbinvd_on_all_cpus())
                 printk(KERN_ERR "Timed out waiting for cache flush.\n");
 
 #elif defined(__powerpc__)
@@ -121,7 +116,7 @@ drm_clflush_sg(struct sg_table *st)
                 return;
         }
 
-        if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
+        if (wbinvd_on_all_cpus())
                 printk(KERN_ERR "Timed out waiting for cache flush.\n");
 #else
         printk(KERN_ERR "Architecture has no drm_cache.c support\n");
@@ -144,7 +139,7 @@ drm_clflush_virt_range(void *addr, unsigned long length)
                 return;
         }
 
-        if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
+        if (wbinvd_on_all_cpus())
                 printk(KERN_ERR "Timed out waiting for cache flush.\n");
 #else
         printk(KERN_ERR "Architecture has no drm_cache.c support\n");
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 481bb2598b62..303c9918a2d5 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -61,8 +61,8 @@ static struct drm_framebuffer *add_framebuffer_internal(struct drm_device *dev,
 /*
  * Global properties
  */
-static const struct drm_prop_enum_list drm_dpms_enum_list[] =
-{       { DRM_MODE_DPMS_ON, "On" },
+static const struct drm_prop_enum_list drm_dpms_enum_list[] = {
+        { DRM_MODE_DPMS_ON, "On" },
         { DRM_MODE_DPMS_STANDBY, "Standby" },
         { DRM_MODE_DPMS_SUSPEND, "Suspend" },
         { DRM_MODE_DPMS_OFF, "Off" }
@@ -70,8 +70,7 @@ static const struct drm_prop_enum_list drm_dpms_enum_list[] =
 
 DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)
 
-static const struct drm_prop_enum_list drm_plane_type_enum_list[] =
-{
+static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
         { DRM_PLANE_TYPE_OVERLAY, "Overlay" },
         { DRM_PLANE_TYPE_PRIMARY, "Primary" },
         { DRM_PLANE_TYPE_CURSOR, "Cursor" },
@@ -80,8 +79,7 @@ static const struct drm_prop_enum_list drm_plane_type_enum_list[] =
 /*
  * Optional properties
  */
-static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] =
-{
+static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
         { DRM_MODE_SCALE_NONE, "None" },
         { DRM_MODE_SCALE_FULLSCREEN, "Full" },
         { DRM_MODE_SCALE_CENTER, "Center" },
@@ -97,8 +95,7 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
 /*
  * Non-global properties, but "required" for certain connectors.
  */
-static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] =
-{
+static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = {
         { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
         { DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
         { DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
@@ -106,8 +103,7 @@ static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] =
 
 DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
 
-static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] =
-{
+static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
         { DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
         { DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
         { DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
@@ -116,8 +112,7 @@ static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] =
 DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
                  drm_dvi_i_subconnector_enum_list)
 
-static const struct drm_prop_enum_list drm_tv_select_enum_list[] =
-{
+static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
         { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
         { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
         { DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
@@ -127,8 +122,7 @@ static const struct drm_prop_enum_list drm_tv_select_enum_list[] =
 
 DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
 
-static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] =
-{
+static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
         { DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
         { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
         { DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
@@ -154,8 +148,8 @@ struct drm_conn_prop_enum_list {
 /*
  * Connector and encoder types.
  */
-static struct drm_conn_prop_enum_list drm_connector_enum_list[] =
-{       { DRM_MODE_CONNECTOR_Unknown, "Unknown" },
+static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
+        { DRM_MODE_CONNECTOR_Unknown, "Unknown" },
         { DRM_MODE_CONNECTOR_VGA, "VGA" },
         { DRM_MODE_CONNECTOR_DVII, "DVI-I" },
         { DRM_MODE_CONNECTOR_DVID, "DVI-D" },
@@ -174,8 +168,8 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] =
         { DRM_MODE_CONNECTOR_DSI, "DSI" },
 };
 
-static const struct drm_prop_enum_list drm_encoder_enum_list[] =
-{       { DRM_MODE_ENCODER_NONE, "None" },
+static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
+        { DRM_MODE_ENCODER_NONE, "None" },
         { DRM_MODE_ENCODER_DAC, "DAC" },
         { DRM_MODE_ENCODER_TMDS, "TMDS" },
         { DRM_MODE_ENCODER_LVDS, "LVDS" },
@@ -185,8 +179,7 @@ static const struct drm_prop_enum_list drm_encoder_enum_list[] =
         { DRM_MODE_ENCODER_DPMST, "DP MST" },
 };
 
-static const struct drm_prop_enum_list drm_subpixel_enum_list[] =
-{
+static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
         { SubPixelUnknown, "Unknown" },
         { SubPixelHorizontalRGB, "Horizontal RGB" },
         { SubPixelHorizontalBGR, "Horizontal BGR" },
@@ -1142,6 +1135,7 @@ EXPORT_SYMBOL(drm_encoder_init);
 void drm_encoder_cleanup(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
+
         drm_modeset_lock_all(dev);
         drm_mode_object_put(dev, &encoder->base);
         kfree(encoder->name);
@@ -1185,8 +1179,8 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
         plane->base.properties = &plane->properties;
         plane->dev = dev;
         plane->funcs = funcs;
-        plane->format_types = kmalloc(sizeof(uint32_t) * format_count,
-                                      GFP_KERNEL);
+        plane->format_types = kmalloc_array(format_count, sizeof(uint32_t),
+                                            GFP_KERNEL);
         if (!plane->format_types) {
                 DRM_DEBUG_KMS("out of memory when allocating plane\n");
                 drm_mode_object_put(dev, &plane->base);
@@ -1599,7 +1593,7 @@ static int drm_mode_group_init(struct drm_device *dev, struct drm_mode_group *gr
         total_objects += dev->mode_config.num_encoder;
         total_objects += dev->mode_config.num_bridge;
 
-        group->id_list = kzalloc(total_objects * sizeof(uint32_t), GFP_KERNEL);
+        group->id_list = kcalloc(total_objects, sizeof(uint32_t), GFP_KERNEL);
         if (!group->id_list)
                 return -ENOMEM;
 
@@ -1629,7 +1623,8 @@ int drm_mode_group_init_legacy_group(struct drm_device *dev,
         struct drm_bridge *bridge;
         int ret;
 
-        if ((ret = drm_mode_group_init(dev, group)))
+        ret = drm_mode_group_init(dev, group);
+        if (ret)
                 return ret;
 
         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
@@ -2045,11 +2040,9 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
 
         props_count = connector->properties.count;
 
-        for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
-                if (connector->encoder_ids[i] != 0) {
+        for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
+                if (connector->encoder_ids[i] != 0)
                         encoders_count++;
-                }
-        }
 
         if (out_resp->count_modes == 0) {
                 connector->funcs->fill_modes(connector,
@@ -2533,7 +2526,7 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
  *
  * This is a little helper to wrap internal calls to the ->set_config driver
  * interface. The only thing it adds is correct refcounting dance.
- * 
+ *
  * Returns:
  * Zero on success, negative errno on failure.
  */
@@ -2725,9 +2718,9 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
                         goto out;
                 }
 
-                connector_set = kmalloc(crtc_req->count_connectors *
-                                        sizeof(struct drm_connector *),
-                                        GFP_KERNEL);
+                connector_set = kmalloc_array(crtc_req->count_connectors,
+                                              sizeof(struct drm_connector *),
+                                              GFP_KERNEL);
                 if (!connector_set) {
                         ret = -ENOMEM;
                         goto out;
@@ -2972,6 +2965,7 @@ int drm_mode_cursor2_ioctl(struct drm_device *dev,
                            void *data, struct drm_file *file_priv)
 {
         struct drm_mode_cursor2 *req = data;
+
         return drm_mode_cursor_common(dev, req, file_priv);
 }
 
@@ -3419,7 +3413,7 @@ int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
                         ret = -EINVAL;
                         goto out_err1;
                 }
-                clips = kzalloc(num_clips * sizeof(*clips), GFP_KERNEL);
+                clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
                 if (!clips) {
                         ret = -ENOMEM;
                         goto out_err1;
@@ -3520,7 +3514,8 @@ struct drm_property *drm_property_create(struct drm_device *dev, int flags,
         property->dev = dev;
 
         if (num_values) {
-                property->values = kzalloc(sizeof(uint64_t)*num_values, GFP_KERNEL);
+                property->values = kcalloc(num_values, sizeof(uint64_t),
+                                           GFP_KERNEL);
                 if (!property->values)
                         goto fail;
         }
@@ -4061,7 +4056,7 @@ int drm_mode_getblob_ioctl(struct drm_device *dev,
 
         if (out_resp->length == blob->length) {
                 blob_ptr = (void __user *)(unsigned long)out_resp->data;
-                if (copy_to_user(blob_ptr, blob->data, blob->length)){
+                if (copy_to_user(blob_ptr, blob->data, blob->length)) {
                         ret = -EFAULT;
                         goto done;
                 }
@@ -4208,6 +4203,8 @@ EXPORT_SYMBOL(drm_mode_connector_update_edid_property);
 static bool drm_property_change_valid_get(struct drm_property *property,
                                          uint64_t value, struct drm_mode_object **ref)
 {
+        int i;
+
         if (property->flags & DRM_MODE_PROP_IMMUTABLE)
                 return false;
 
@@ -4219,13 +4216,14 @@ static bool drm_property_change_valid_get(struct drm_property *property,
                 return true;
         } else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE)) {
                 int64_t svalue = U642I64(value);
+
                 if (svalue < U642I64(property->values[0]) ||
                                 svalue > U642I64(property->values[1]))
                         return false;
                 return true;
         } else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
-                int i;
                 uint64_t valid_mask = 0;
+
                 for (i = 0; i < property->num_values; i++)
                         valid_mask |= (1ULL << property->values[i]);
                 return !(value & ~valid_mask);
@@ -4257,6 +4255,11 @@ static bool drm_property_change_valid_get(struct drm_property *property,
                                 return true;
                 return false;
         }
+
+        for (i = 0; i < property->num_values; i++)
+                if (property->values[i] == value)
+                        return true;
+        return false;
 }
 
 static void drm_property_change_valid_put(struct drm_property *property,
@@ -4564,7 +4567,8 @@ int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
 {
         crtc->gamma_size = gamma_size;
 
-        crtc->gamma_store = kzalloc(gamma_size * sizeof(uint16_t) * 3, GFP_KERNEL);
+        crtc->gamma_store = kcalloc(gamma_size, sizeof(uint16_t) * 3,
+                                    GFP_KERNEL);
         if (!crtc->gamma_store) {
                 crtc->gamma_size = 0;
                 return -ENOMEM;
@@ -4779,23 +4783,23 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
         if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
                 ret = -ENOMEM;
                 spin_lock_irqsave(&dev->event_lock, flags);
-                if (file_priv->event_space < sizeof e->event) {
+                if (file_priv->event_space < sizeof(e->event)) {
                         spin_unlock_irqrestore(&dev->event_lock, flags);
                         goto out;
                 }
-                file_priv->event_space -= sizeof e->event;
+                file_priv->event_space -= sizeof(e->event);
                 spin_unlock_irqrestore(&dev->event_lock, flags);
 
-                e = kzalloc(sizeof *e, GFP_KERNEL);
+                e = kzalloc(sizeof(*e), GFP_KERNEL);
                 if (e == NULL) {
                         spin_lock_irqsave(&dev->event_lock, flags);
-                        file_priv->event_space += sizeof e->event;
+                        file_priv->event_space += sizeof(e->event);
                         spin_unlock_irqrestore(&dev->event_lock, flags);
                         goto out;
                 }
 
                 e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
-                e->event.base.length = sizeof e->event;
+                e->event.base.length = sizeof(e->event);
                 e->event.user_data = page_flip->user_data;
                 e->base.event = &e->event.base;
                 e->base.file_priv = file_priv;
@@ -4808,7 +4812,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
         if (ret) {
                 if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
                         spin_lock_irqsave(&dev->event_lock, flags);
-                        file_priv->event_space += sizeof e->event;
+                        file_priv->event_space += sizeof(e->event);
                         spin_unlock_irqrestore(&dev->event_lock, flags);
                         kfree(e);
                 }
diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c
index 51efebd434f3..f1b32f91d941 100644
--- a/drivers/gpu/drm/drm_info.c
+++ b/drivers/gpu/drm/drm_info.c
@@ -153,30 +153,6 @@ int drm_bufs_info(struct seq_file *m, void *data)
 }
 
 /**
- * Called when "/proc/dri/.../vblank" is read.
- */
-int drm_vblank_info(struct seq_file *m, void *data)
-{
-        struct drm_info_node *node = (struct drm_info_node *) m->private;
-        struct drm_device *dev = node->minor->dev;
-        int crtc;
-
-        mutex_lock(&dev->struct_mutex);
-        for (crtc = 0; crtc < dev->num_crtcs; crtc++) {
-                seq_printf(m, "CRTC %d enable:     %d\n",
-                           crtc, atomic_read(&dev->vblank[crtc].refcount));
-                seq_printf(m, "CRTC %d counter:    %d\n",
-                           crtc, drm_vblank_count(dev, crtc));
-                seq_printf(m, "CRTC %d last wait:  %d\n",
-                           crtc, dev->vblank[crtc].last_wait);
-                seq_printf(m, "CRTC %d in modeset: %d\n",
-                           crtc, dev->vblank[crtc].inmodeset);
-        }
-        mutex_unlock(&dev->struct_mutex);
-        return 0;
-}
-
-/**
  * Called when "/proc/dri/.../clients" is read.
  *
  */
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 7cc0a3516871..12a61d706827 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -55,7 +55,6 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
 int drm_name_info(struct seq_file *m, void *data);
 int drm_vm_info(struct seq_file *m, void *data);
 int drm_bufs_info(struct seq_file *m, void *data);
-int drm_vblank_info(struct seq_file *m, void *data);
 int drm_clients_info(struct seq_file *m, void* data);
 int drm_gem_name_info(struct seq_file *m, void *data);
 
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index f5a5f18efa5b..920cdb91e9d0 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -778,7 +778,7 @@ static struct timeval get_drm_timestamp(void)
 
 /**
  * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
- *                             vblank interval
+ *                             vblank interval
  * @dev: DRM device
  * @crtc: which CRTC's vblank timestamp to retrieve
  * @tvblank: Pointer to target struct timeval which should receive the timestamp
@@ -910,6 +910,7 @@ void drm_send_vblank_event(struct drm_device *dev, int crtc,
 {
         struct timeval now;
         unsigned int seq;
+
         if (crtc >= 0) {
                 seq = drm_vblank_count_and_time(dev, crtc, &now);
         } else {
@@ -1382,7 +1383,7 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
         unsigned int seq;
         int ret;
 
-        e = kzalloc(sizeof *e, GFP_KERNEL);
+        e = kzalloc(sizeof(*e), GFP_KERNEL);
         if (e == NULL) {
                 ret = -ENOMEM;
                 goto err_put;
@@ -1391,7 +1392,7 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
         e->pipe = pipe;
         e->base.pid = current->pid;
         e->event.base.type = DRM_EVENT_VBLANK;
-        e->event.base.length = sizeof e->event;
+        e->event.base.length = sizeof(e->event);
         e->event.user_data = vblwait->request.signal;
         e->base.event = &e->event.base;
         e->base.file_priv = file_priv;
@@ -1411,12 +1412,12 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
                 goto err_unlock;
         }
 
-        if (file_priv->event_space < sizeof e->event) {
+        if (file_priv->event_space < sizeof(e->event)) {
                 ret = -EBUSY;
                 goto err_unlock;
         }
 
-        file_priv->event_space -= sizeof e->event;
+        file_priv->event_space -= sizeof(e->event);
         seq = drm_vblank_count_and_time(dev, pipe, &now);
 
         if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index ae61fb21ea86..f24c4cfe674b 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -142,6 +142,17 @@ int drm_plane_helper_check_update(struct drm_plane *plane,
 {
         int hscale, vscale;
 
+        if (!fb) {
+                *visible = false;
+                return 0;
+        }
+
+        /* crtc should only be NULL when disabling (i.e., !fb) */
+        if (WARN_ON(!crtc)) {
+                *visible = false;
+                return 0;
+        }
+
         if (!crtc->enabled && !can_update_disabled) {
                 DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
                 return -EINVAL;
@@ -155,11 +166,6 @@ int drm_plane_helper_check_update(struct drm_plane *plane,
                 return -ERANGE;
         }
 
-        if (!fb) {
-                *visible = false;
-                return 0;
-        }
-
         *visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);
         if (!*visible)
                 /*
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
index a7672e100d8b..ac2a6ebce674 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
@@ -323,10 +323,6 @@ static void mdp4_crtc_commit(struct drm_crtc *crtc)
         drm_crtc_vblank_put(crtc);
 }
 
-static void mdp4_crtc_load_lut(struct drm_crtc *crtc)
-{
-}
-
 static int mdp4_crtc_atomic_check(struct drm_crtc *crtc,
                 struct drm_crtc_state *state)
 {
@@ -524,7 +520,6 @@ static const struct drm_crtc_helper_funcs mdp4_crtc_helper_funcs = {
         .mode_set_base = drm_helper_crtc_mode_set_base,
         .prepare = mdp4_crtc_prepare,
         .commit = mdp4_crtc_commit,
-        .load_lut = mdp4_crtc_load_lut,
         .atomic_check = mdp4_crtc_atomic_check,
         .atomic_begin = mdp4_crtc_atomic_begin,
         .atomic_flush = mdp4_crtc_atomic_flush,
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c
index 0e9a2e3a82d7..92d52a56b3b8 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c
@@ -275,10 +275,6 @@ static void mdp5_crtc_commit(struct drm_crtc *crtc)
         mdp5_disable(get_kms(crtc));
 }
 
-static void mdp5_crtc_load_lut(struct drm_crtc *crtc)
-{
-}
-
 struct plane_state {
         struct drm_plane *plane;
         struct mdp5_plane_state *state;
@@ -407,7 +403,6 @@ static const struct drm_crtc_helper_funcs mdp5_crtc_helper_funcs = {
         .mode_set_base = drm_helper_crtc_mode_set_base,
         .prepare = mdp5_crtc_prepare,
         .commit = mdp5_crtc_commit,
-        .load_lut = mdp5_crtc_load_lut,
         .atomic_check = mdp5_crtc_atomic_check,
         .atomic_begin = mdp5_crtc_atomic_begin,
         .atomic_flush = mdp5_crtc_atomic_flush,
diff --git a/drivers/gpu/drm/sti/sti_drm_crtc.c b/drivers/gpu/drm/sti/sti_drm_crtc.c
index 4c651c200f20..e6f6ef7c4866 100644
--- a/drivers/gpu/drm/sti/sti_drm_crtc.c
+++ b/drivers/gpu/drm/sti/sti_drm_crtc.c
@@ -190,11 +190,6 @@ out:
         return ret;
 }
 
-static void sti_drm_crtc_load_lut(struct drm_crtc *crtc)
-{
-        /* do nothing */
-}
-
 static void sti_drm_crtc_disable(struct drm_crtc *crtc)
 {
         struct sti_mixer *mixer = to_sti_mixer(crtc);
@@ -249,7 +244,6 @@ static struct drm_crtc_helper_funcs sti_crtc_helper_funcs = {
         .mode_fixup = sti_drm_crtc_mode_fixup,
         .mode_set = sti_drm_crtc_mode_set,
         .mode_set_base = sti_drm_crtc_mode_set_base,
-        .load_lut = sti_drm_crtc_load_lut,
         .disable = sti_drm_crtc_disable,
 };
 
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 3367960286a6..7fe7bb1227cf 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1095,10 +1095,6 @@ static void tegra_crtc_commit(struct drm_crtc *crtc)
         tegra_dc_commit(dc);
 }
 
-static void tegra_crtc_load_lut(struct drm_crtc *crtc)
-{
-}
-
 static const struct drm_crtc_helper_funcs tegra_crtc_helper_funcs = {
         .disable = tegra_crtc_disable,
         .mode_fixup = tegra_crtc_mode_fixup,
@@ -1106,7 +1102,6 @@ static const struct drm_crtc_helper_funcs tegra_crtc_helper_funcs = {
         .mode_set_base = tegra_crtc_mode_set_base,
         .prepare = tegra_crtc_prepare,
         .commit = tegra_crtc_commit,
-        .load_lut = tegra_crtc_load_lut,
 };
 
 static irqreturn_t tegra_dc_irq(int irq, void *data)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 86574b0005ff..aae71cb32123 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -338,7 +338,7 @@ struct drm_mode_fb_cmd2 {
 
         /*
          * In case of planar formats, this ioctl allows up to 4
-         * buffer objects with offets and pitches per plane.
+         * buffer objects with offsets and pitches per plane.
          * The pitch and offset order is dictated by the fourcc,
          * e.g. NV12 (http://fourcc.org/yuv.php#NV12) is described as:
          *
@@ -346,9 +346,9 @@ struct drm_mode_fb_cmd2 {
          *   followed by an interleaved U/V plane containing
          *   8 bit 2x2 subsampled colour difference samples.
          *
-         * So it would consist of Y as offset[0] and UV as
-         * offeset[1].  Note that offset[0] will generally
-         * be 0.
+         * So it would consist of Y as offsets[0] and UV as
+         * offsets[1].  Note that offsets[0] will generally
+         * be 0 (but this is not required).
          */
         __u32 handles[4];
         __u32 pitches[4]; /* pitch for each plane */