Merge tag 'topic/drm-misc-2015-05-06' of git://anongit.freedesktop.org/drm-intel into drm-next

misc drm core patches.

* tag 'topic/drm-misc-2015-05-06' of git://anongit.freedesktop.org/drm-intel:
  drm: simplify master cleanup
  drm: simplify authentication management
  drm: drop unused 'magicfree' list
  drm: fix a memleak on mutex failure path
  drm/atomic-helper: Really recover pre-atomic plane/cursor behavior
  drm/qxl: Fix qxl_noop_get_vblank_counter()
  drm: Zero out invalid vblank timestamp in drm_update_vblank_count. (v2)
  drm: Prevent invalid use of vblank_disable_immediate. (v2)
  drm/vblank: Fixup and document timestamp update/read barriers
  DRM: Don't re-poll connector for disconnect
  drm: Fix for DP CTS test 4.2.2.5 - I2C DEFER handling
  drm: Fix the 'native defer' message in drm_dp_i2c_do_msg()
  drm/atomic-helper: Don't call atomic_update_plane when it stays off

11 files changed, 124 insertions, 224 deletions

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 1d2ca52530d5..5d30592c83cd 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1138,7 +1138,8 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
 		if (drm_atomic_plane_disabling(plane, old_plane_state) &&
 		    funcs->atomic_disable)
 			funcs->atomic_disable(plane, old_plane_state);
-		else
+		else if (plane->state->crtc ||
+			 drm_atomic_plane_disabling(plane, old_plane_state))
 			funcs->atomic_update(plane, old_plane_state);
 	}
 
@@ -1309,13 +1310,13 @@ retry:
 	plane_state->src_h = src_h;
 	plane_state->src_w = src_w;
 
+	if (plane == crtc->cursor)
+		state->legacy_cursor_update = true;
+
 	ret = drm_atomic_commit(state);
 	if (ret != 0)
 		goto fail;
 
-	if (plane == crtc->cursor)
-		state->legacy_cursor_update = true;
-
 	/* Driver takes ownership of state on successful commit. */
 	return 0;
 fail:
diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index fc8e8aaa34fb..50d0baa06db0 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -1,11 +1,3 @@
-/**
- * \file drm_auth.c
- * IOCTLs for authentication
- *
- * \author Rickard E. (Rik) Faith <faith@valinux.com>
- * \author Gareth Hughes <gareth@valinux.com>
- */
-
 /*
  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
  *
@@ -13,6 +5,9 @@
  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  * All Rights Reserved.
  *
+ * Author Rickard E. (Rik) Faith <faith@valinux.com>
+ * Author Gareth Hughes <gareth@valinux.com>
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
@@ -36,154 +31,47 @@
 #include <drm/drmP.h>
 #include "drm_internal.h"
 
-struct drm_magic_entry {
-	struct list_head head;
-	struct drm_hash_item hash_item;
-	struct drm_file *priv;
-};
-
-/**
- * Find the file with the given magic number.
- *
- * \param dev DRM device.
- * \param magic magic number.
- *
- * Searches in drm_device::magiclist within all files with the same hash key
- * the one with matching magic number, while holding the drm_device::struct_mutex
- * lock.
- */
-static struct drm_file *drm_find_file(struct drm_master *master, drm_magic_t magic)
-{
-	struct drm_file *retval = NULL;
-	struct drm_magic_entry *pt;
-	struct drm_hash_item *hash;
-	struct drm_device *dev = master->minor->dev;
-
-	mutex_lock(&dev->struct_mutex);
-	if (!drm_ht_find_item(&master->magiclist, (unsigned long)magic, &hash)) {
-		pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item);
-		retval = pt->priv;
-	}
-	mutex_unlock(&dev->struct_mutex);
-	return retval;
-}
-
-/**
- * Adds a magic number.
- *
- * \param dev DRM device.
- * \param priv file private data.
- * \param magic magic number.
- *
- * Creates a drm_magic_entry structure and appends to the linked list
- * associated the magic number hash key in drm_device::magiclist, while holding
- * the drm_device::struct_mutex lock.
- */
-static int drm_add_magic(struct drm_master *master, struct drm_file *priv,
-			 drm_magic_t magic)
-{
-	struct drm_magic_entry *entry;
-	struct drm_device *dev = master->minor->dev;
-	DRM_DEBUG("%d\n", magic);
-
-	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
-	if (!entry)
-		return -ENOMEM;
-	entry->priv = priv;
-	entry->hash_item.key = (unsigned long)magic;
-	mutex_lock(&dev->struct_mutex);
-	drm_ht_insert_item(&master->magiclist, &entry->hash_item);
-	list_add_tail(&entry->head, &master->magicfree);
-	mutex_unlock(&dev->struct_mutex);
-
-	return 0;
-}
-
-/**
- * Remove a magic number.
- *
- * \param dev DRM device.
- * \param magic magic number.
- *
- * Searches and unlinks the entry in drm_device::magiclist with the magic
- * number hash key, while holding the drm_device::struct_mutex lock.
- */
-int drm_remove_magic(struct drm_master *master, drm_magic_t magic)
-{
-	struct drm_magic_entry *pt;
-	struct drm_hash_item *hash;
-	struct drm_device *dev = master->minor->dev;
-
-	DRM_DEBUG("%d\n", magic);
-
-	mutex_lock(&dev->struct_mutex);
-	if (drm_ht_find_item(&master->magiclist, (unsigned long)magic, &hash)) {
-		mutex_unlock(&dev->struct_mutex);
-		return -EINVAL;
-	}
-	pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item);
-	drm_ht_remove_item(&master->magiclist, hash);
-	list_del(&pt->head);
-	mutex_unlock(&dev->struct_mutex);
-
-	kfree(pt);
-
-	return 0;
-}
-
 /**
- * Get a unique magic number (ioctl).
+ * drm_getmagic - Get unique magic of a client
+ * @dev: DRM device to operate on
+ * @data: ioctl data containing the drm_auth object
+ * @file_priv: DRM file that performs the operation
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a resulting drm_auth structure.
- * \return zero on success, or a negative number on failure.
+ * This looks up the unique magic of the passed client and returns it. If the
+ * client did not have a magic assigned, yet, a new one is registered. The magic
+ * is stored in the passed drm_auth object.
  *
- * If there is a magic number in drm_file::magic then use it, otherwise
- * searches an unique non-zero magic number and add it associating it with \p
- * file_priv.
- * This ioctl needs protection by the drm_global_mutex, which protects
- * struct drm_file::magic and struct drm_magic_entry::priv.
+ * Returns: 0 on success, negative error code on failure.
  */
 int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
-	static drm_magic_t sequence = 0;
-	static DEFINE_SPINLOCK(lock);
 	struct drm_auth *auth = data;
+	int ret = 0;
 
-	/* Find unique magic */
-	if (file_priv->magic) {
-		auth->magic = file_priv->magic;
-	} else {
-		do {
-			spin_lock(&lock);
-			if (!sequence)
-				++sequence;	/* reserve 0 */
-			auth->magic = sequence++;
-			spin_unlock(&lock);
-		} while (drm_find_file(file_priv->master, auth->magic));
-		file_priv->magic = auth->magic;
-		drm_add_magic(file_priv->master, file_priv, auth->magic);
+	mutex_lock(&dev->struct_mutex);
+	if (!file_priv->magic) {
+		ret = idr_alloc(&file_priv->master->magic_map, file_priv,
+				1, 0, GFP_KERNEL);
+		if (ret >= 0)
+			file_priv->magic = ret;
 	}
+	auth->magic = file_priv->magic;
+	mutex_unlock(&dev->struct_mutex);
 
 	DRM_DEBUG("%u\n", auth->magic);
 
-	return 0;
+	return ret < 0 ? ret : 0;
 }
 
 /**
- * Authenticate with a magic.
+ * drm_authmagic - Authenticate client with a magic
+ * @dev: DRM device to operate on
+ * @data: ioctl data containing the drm_auth object
+ * @file_priv: DRM file that performs the operation
  *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg pointer to a drm_auth structure.
- * \return zero if authentication successed, or a negative number otherwise.
+ * This looks up a DRM client by the passed magic and authenticates it.
  *
- * Checks if \p file_priv is associated with the magic number passed in \arg.
- * This ioctl needs protection by the drm_global_mutex, which protects
- * struct drm_file::magic and struct drm_magic_entry::priv.
+ * Returns: 0 on success, negative error code on failure.
  */
 int drm_authmagic(struct drm_device *dev, void *data,
 		  struct drm_file *file_priv)
@@ -192,10 +80,14 @@ int drm_authmagic(struct drm_device *dev, void *data,
 	struct drm_file *file;
 
 	DRM_DEBUG("%u\n", auth->magic);
-	if ((file = drm_find_file(file_priv->master, auth->magic))) {
+
+	mutex_lock(&dev->struct_mutex);
+	file = idr_find(&file_priv->master->magic_map, auth->magic);
+	if (file) {
 		file->authenticated = 1;
-		drm_remove_magic(file_priv->master, auth->magic);
-		return 0;
+		idr_replace(&file_priv->master->magic_map, NULL, auth->magic);
 	}
-	return -EINVAL;
+	mutex_unlock(&dev->struct_mutex);
+
+	return file ? 0 : -EINVAL;
 }
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 71dcbc64ae98..80a02a412607 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -432,7 +432,7 @@ static u32 drm_dp_i2c_functionality(struct i2c_adapter *adapter)
  */
 static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 {
-	unsigned int retry;
+	unsigned int retry, defer_i2c;
 	int ret;
 
 	/*
@@ -440,7 +440,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 	 * is required to retry at least seven times upon receiving AUX_DEFER
 	 * before giving up the AUX transaction.
 	 */
-	for (retry = 0; retry < 7; retry++) {
+	for (retry = 0, defer_i2c = 0; retry < (7 + defer_i2c); retry++) {
 		mutex_lock(&aux->hw_mutex);
 		ret = aux->transfer(aux, msg);
 		mutex_unlock(&aux->hw_mutex);
@@ -466,7 +466,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 			return -EREMOTEIO;
 
 		case DP_AUX_NATIVE_REPLY_DEFER:
-			DRM_DEBUG_KMS("native defer");
+			DRM_DEBUG_KMS("native defer\n");
 			/*
 			 * We could check for I2C bit rate capabilities and if
 			 * available adjust this interval. We could also be
@@ -499,7 +499,13 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 
 		case DP_AUX_I2C_REPLY_DEFER:
 			DRM_DEBUG_KMS("I2C defer\n");
+			/* DP Compliance Test 4.2.2.5 Requirement:
+			 * Must have at least 7 retries for I2C defers on the
+			 * transaction to pass this test
+			 */
 			aux->i2c_defer_count++;
+			if (defer_i2c < 7)
+				defer_i2c++;
 			usleep_range(400, 500);
 			continue;
 
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 48f7359e2a6b..3b3c4f537e95 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -92,8 +92,6 @@ void drm_ut_debug_printk(const char *function_name, const char *format, ...)
 }
 EXPORT_SYMBOL(drm_ut_debug_printk);
 
-#define DRM_MAGIC_HASH_ORDER  4  /**< Size of key hash table. Must be power of 2. */
-
 struct drm_master *drm_master_create(struct drm_minor *minor)
 {
 	struct drm_master *master;
@@ -105,11 +103,7 @@ struct drm_master *drm_master_create(struct drm_minor *minor)
 	kref_init(&master->refcount);
 	spin_lock_init(&master->lock.spinlock);
 	init_waitqueue_head(&master->lock.lock_queue);
-	if (drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER)) {
-		kfree(master);
-		return NULL;
-	}
-	INIT_LIST_HEAD(&master->magicfree);
+	idr_init(&master->magic_map);
 	master->minor = minor;
 
 	return master;
@@ -138,16 +132,10 @@ static void drm_master_destroy(struct kref *kref)
 			r_list = NULL;
 		}
 	}
-
-	if (master->unique) {
-		kfree(master->unique);
-		master->unique = NULL;
-		master->unique_len = 0;
-	}
-
-	drm_ht_remove(&master->magiclist);
-
 	mutex_unlock(&dev->struct_mutex);
+
+	idr_destroy(&master->magic_map);
+	kfree(master->unique);
 	kfree(master);
 }
 
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 076dd606b580..0f6a5c8801e3 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -380,6 +380,8 @@ int drm_release(struct inode *inode, struct file *filp)
 
 	mutex_lock(&dev->struct_mutex);
 	list_del(&file_priv->lhead);
+	if (file_priv->magic)
+		idr_remove(&file_priv->master->magic_map, file_priv->magic);
 	mutex_unlock(&dev->struct_mutex);
 
 	if (dev->driver->preclose)
@@ -394,11 +396,6 @@ int drm_release(struct inode *inode, struct file *filp)
 		  (long)old_encode_dev(file_priv->minor->kdev->devt),
 		  dev->open_count);
 
-	/* Release any auth tokens that might point to this file_priv,
-	   (do that under the drm_global_mutex) */
-	if (file_priv->magic)
-		(void) drm_remove_magic(file_priv->master, file_priv->magic);
-
 	/* if the master has gone away we can't do anything with the lock */
 	if (file_priv->minor->master)
 		drm_master_release(dev, filp);
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 12a61d706827..059af01bd07a 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -69,7 +69,6 @@ int drm_getmagic(struct drm_device *dev, void *data,
 		 struct drm_file *file_priv);
 int drm_authmagic(struct drm_device *dev, void *data,
 		  struct drm_file *file_priv);
-int drm_remove_magic(struct drm_master *master, drm_magic_t magic);
 
 /* drm_sysfs.c */
 extern struct class *drm_class;
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index c8a34476570a..1967e7fc9805 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -74,6 +74,36 @@ module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
 module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
 module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
 
+static void store_vblank(struct drm_device *dev, int crtc,
+			 unsigned vblank_count_inc,
+			 struct timeval *t_vblank)
+{
+	struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
+	u32 tslot;
+
+	assert_spin_locked(&dev->vblank_time_lock);
+
+	if (t_vblank) {
+		/* All writers hold the spinlock, but readers are serialized by
+		 * the latching of vblank->count below.
+		 */
+		tslot = vblank->count + vblank_count_inc;
+		vblanktimestamp(dev, crtc, tslot) = *t_vblank;
+	}
+
+	/*
+	 * vblank timestamp updates are protected on the write side with
+	 * vblank_time_lock, but on the read side done locklessly using a
+	 * sequence-lock on the vblank counter. Ensure correct ordering using
+	 * memory barrriers. We need the barrier both before and also after the
+	 * counter update to synchronize with the next timestamp write.
+	 * The read-side barriers for this are in drm_vblank_count_and_time.
+	 */
+	smp_wmb();
+	vblank->count += vblank_count_inc;
+	smp_wmb();
+}
+
 /**
  * drm_update_vblank_count - update the master vblank counter
  * @dev: DRM device
@@ -93,7 +123,7 @@ module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
 {
 	struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
-	u32 cur_vblank, diff, tslot;
+	u32 cur_vblank, diff;
 	bool rc;
 	struct timeval t_vblank;
 
@@ -129,18 +159,15 @@ static void drm_update_vblank_count(struct drm_device *dev, int crtc)
 	if (diff == 0)
 		return;
 
-	/* Reinitialize corresponding vblank timestamp if high-precision query
-	 * available. Skip this step if query unsupported or failed. Will
-	 * reinitialize delayed at next vblank interrupt in that case.
+	/*
+	 * Only reinitialize corresponding vblank timestamp if high-precision query
+	 * available and didn't fail. Otherwise reinitialize delayed at next vblank
+	 * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid.
 	 */
-	if (rc) {
-		tslot = atomic_read(&vblank->count) + diff;
-		vblanktimestamp(dev, crtc, tslot) = t_vblank;
-	}
+	if (!rc)
+		t_vblank = (struct timeval) {0, 0};
 
-	smp_mb__before_atomic();
-	atomic_add(diff, &vblank->count);
-	smp_mb__after_atomic();
+	store_vblank(dev, crtc, diff, &t_vblank);
 }
 
 /*
@@ -218,7 +245,7 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
 	/* Compute time difference to stored timestamp of last vblank
 	 * as updated by last invocation of drm_handle_vblank() in vblank irq.
 	 */
-	vblcount = atomic_read(&vblank->count);
+	vblcount = vblank->count;
 	diff_ns = timeval_to_ns(&tvblank) -
 		  timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
 
@@ -234,17 +261,8 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
 	 * available. In that case we can't account for this and just
 	 * hope for the best.
 	 */
-	if (vblrc && (abs64(diff_ns) > 1000000)) {
-		/* Store new timestamp in ringbuffer. */
-		vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
-
-		/* Increment cooked vblank count. This also atomically commits
-		 * the timestamp computed above.
-		 */
-		smp_mb__before_atomic();
-		atomic_inc(&vblank->count);
-		smp_mb__after_atomic();
-	}
+	if (vblrc && (abs64(diff_ns) > 1000000))
+		store_vblank(dev, crtc, 1, &tvblank);
 
 	spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
 }
@@ -337,6 +355,13 @@ int drm_vblank_init(struct drm_device *dev, int num_crtcs)
 	else
 		DRM_INFO("No driver support for vblank timestamp query.\n");
 
+	/* Must have precise timestamping for reliable vblank instant disable */
+	if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) {
+		dev->vblank_disable_immediate = false;
+		DRM_INFO("Setting vblank_disable_immediate to false because "
+			 "get_vblank_timestamp == NULL\n");
+	}
+
 	dev->vblank_disable_allowed = false;
 
 	return 0;
@@ -852,7 +877,7 @@ u32 drm_vblank_count(struct drm_device *dev, int crtc)
 
 	if (WARN_ON(crtc >= dev->num_crtcs))
 		return 0;
-	return atomic_read(&vblank->count);
+	return vblank->count;
 }
 EXPORT_SYMBOL(drm_vblank_count);
 
@@ -897,16 +922,17 @@ u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
 	if (WARN_ON(crtc >= dev->num_crtcs))
 		return 0;
 
-	/* Read timestamp from slot of _vblank_time ringbuffer
-	 * that corresponds to current vblank count. Retry if
-	 * count has incremented during readout. This works like
-	 * a seqlock.
+	/*
+	 * Vblank timestamps are read lockless. To ensure consistency the vblank
+	 * counter is rechecked and ordering is ensured using memory barriers.
+	 * This works like a seqlock. The write-side barriers are in store_vblank.
 	 */
 	do {
-		cur_vblank = atomic_read(&vblank->count);
+		cur_vblank = vblank->count;
+		smp_rmb();
 		*vblanktime = vblanktimestamp(dev, crtc, cur_vblank);
 		smp_rmb();
-	} while (cur_vblank != atomic_read(&vblank->count));
+	} while (cur_vblank != vblank->count);
 
 	return cur_vblank;
 }
@@ -1715,7 +1741,7 @@ bool drm_handle_vblank(struct drm_device *dev, int crtc)
 	 */
 
 	/* Get current timestamp and count. */
-	vblcount = atomic_read(&vblank->count);
+	vblcount = vblank->count;
 	drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ);
 
 	/* Compute time difference to timestamp of last vblank */
@@ -1731,20 +1757,11 @@ bool drm_handle_vblank(struct drm_device *dev, int crtc)
 	 * e.g., due to spurious vblank interrupts. We need to
 	 * ignore those for accounting.
 	 */
-	if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) {
-		/* Store new timestamp in ringbuffer. */
-		vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
-
-		/* Increment cooked vblank count. This also atomically commits
-		 * the timestamp computed above.
-		 */
-		smp_mb__before_atomic();
-		atomic_inc(&vblank->count);
-		smp_mb__after_atomic();
-	} else {
+	if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS)
+		store_vblank(dev, crtc, 1, &tvblank);
+	else
 		DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n",
 			  crtc, (int) diff_ns);
-	}
 
 	spin_unlock(&dev->vblank_time_lock);
 
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 51cc47d827d8..c0a5cd8c5262 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -80,8 +80,10 @@ int __drm_modeset_lock_all(struct drm_device *dev,
 		return -ENOMEM;
 
 	if (trylock) {
-		if (!mutex_trylock(&config->mutex))
-			return -EBUSY;
+		if (!mutex_trylock(&config->mutex)) {
+			ret = -EBUSY;
+			goto out;
+		}
 	} else {
 		mutex_lock(&config->mutex);
 	}
@@ -114,6 +116,8 @@ fail:
 		goto retry;
 	}
 
+out:
+	kfree(ctx);
 	return ret;
 }
 EXPORT_SYMBOL(__drm_modeset_lock_all);
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 63503879a676..04203c0d2ecb 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -323,8 +323,6 @@ static void output_poll_execute(struct work_struct *work)
 		if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
 			continue;
 
-		repoll = true;
-
 		old_status = connector->status;
 		/* if we are connected and don't want to poll for disconnect
 		   skip it */
@@ -332,6 +330,8 @@ static void output_poll_execute(struct work_struct *work)
 		    !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
 			continue;
 
+		repoll = true;
+
 		connector->status = connector->funcs->detect(connector, false);
 		if (old_status != connector->status) {
 			const char *old, *new;
diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index 976b89156570..cb383a0fc392 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -172,10 +172,6 @@ static void intel_plane_atomic_update(struct drm_plane *plane,
 	struct intel_plane_state *intel_state =
 		to_intel_plane_state(plane->state);
 
-	/* Don't disable an already disabled plane */
-	if (!plane->state->fb && !old_state->fb)
-		return;
-
 	intel_plane->commit_plane(plane, intel_state);
 }
 
diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
index e2d07085b6a5..83f6f0b5e9ef 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.c
+++ b/drivers/gpu/drm/qxl/qxl_drv.c
@@ -198,7 +198,7 @@ static int qxl_pm_restore(struct device *dev)
 
 static u32 qxl_noop_get_vblank_counter(struct drm_device *dev, int crtc)
 {
-	return dev->vblank[crtc].count.counter;
+	return 0;
 }
 
 static int qxl_noop_enable_vblank(struct drm_device *dev, int crtc)