Merge remote-tracking branch 'tip/perf/urgent' into perf/core

To pick up fixes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

15 files changed, 174 insertions, 105 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index ec0d62a16e53..4f22e745df51 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -358,8 +358,8 @@ static int create_compute_queue_nocpsch(struct device_queue_manager *dqm,
 					struct queue *q,
 					struct qcm_process_device *qpd)
 {
-	int retval;
 	struct mqd_manager *mqd_mgr;
+	int retval;
 
 	mqd_mgr = dqm->ops.get_mqd_manager(dqm, KFD_MQD_TYPE_COMPUTE);
 	if (!mqd_mgr)
@@ -387,8 +387,12 @@ static int create_compute_queue_nocpsch(struct device_queue_manager *dqm,
 	if (!q->properties.is_active)
 		return 0;
 
-	retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe, q->queue,
-			&q->properties, q->process->mm);
+	if (WARN(q->process->mm != current->mm,
+		 "should only run in user thread"))
+		retval = -EFAULT;
+	else
+		retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe, q->queue,
+					   &q->properties, current->mm);
 	if (retval)
 		goto out_uninit_mqd;
 
@@ -545,9 +549,15 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
 		retval = map_queues_cpsch(dqm);
 	else if (q->properties.is_active &&
 		 (q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
-		  q->properties.type == KFD_QUEUE_TYPE_SDMA))
-		retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe, q->queue,
-				       &q->properties, q->process->mm);
+		  q->properties.type == KFD_QUEUE_TYPE_SDMA)) {
+		if (WARN(q->process->mm != current->mm,
+			 "should only run in user thread"))
+			retval = -EFAULT;
+		else
+			retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd,
+						   q->pipe, q->queue,
+						   &q->properties, current->mm);
+	}
 
 out_unlock:
 	dqm_unlock(dqm);
@@ -653,6 +663,7 @@ out:
 static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
 					  struct qcm_process_device *qpd)
 {
+	struct mm_struct *mm = NULL;
 	struct queue *q;
 	struct mqd_manager *mqd_mgr;
 	struct kfd_process_device *pdd;
@@ -686,6 +697,15 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
 		kfd_flush_tlb(pdd);
 	}
 
+	/* Take a safe reference to the mm_struct, which may otherwise
+	 * disappear even while the kfd_process is still referenced.
+	 */
+	mm = get_task_mm(pdd->process->lead_thread);
+	if (!mm) {
+		retval = -EFAULT;
+		goto out;
+	}
+
 	/* activate all active queues on the qpd */
 	list_for_each_entry(q, &qpd->queues_list, list) {
 		if (!q->properties.is_evicted)
@@ -700,14 +720,15 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
 		q->properties.is_evicted = false;
 		q->properties.is_active = true;
 		retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe,
-				       q->queue, &q->properties,
-				       q->process->mm);
+				       q->queue, &q->properties, mm);
 		if (retval)
 			goto out;
 		dqm->queue_count++;
 	}
 	qpd->evicted = 0;
 out:
+	if (mm)
+		mmput(mm);
 	dqm_unlock(dqm);
 	return retval;
 }
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 96875950845a..6903fe6c894b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4633,12 +4633,18 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 	}
 	spin_unlock_irqrestore(&adev->ddev->event_lock, flags);
 
-	/* Signal HW programming completion */
-	drm_atomic_helper_commit_hw_done(state);
 
 	if (wait_for_vblank)
 		drm_atomic_helper_wait_for_flip_done(dev, state);
 
+	/*
+	 * FIXME:
+	 * Delay hw_done() until flip_done() is signaled. This is to block
+	 * another commit from freeing the CRTC state while we're still
+	 * waiting on flip_done.
+	 */
+	drm_atomic_helper_commit_hw_done(state);
+
 	drm_atomic_helper_cleanup_planes(dev, state);
 
 	/* Finally, drop a runtime PM reference for each newly disabled CRTC,
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index baff50a4c234..df31c3815092 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -63,20 +63,21 @@ static void drm_client_close(struct drm_client_dev *client)
 EXPORT_SYMBOL(drm_client_close);
 
 /**
- * drm_client_new - Create a DRM client
+ * drm_client_init - Initialise a DRM client
  * @dev: DRM device
  * @client: DRM client
  * @name: Client name
  * @funcs: DRM client functions (optional)
  *
+ * This initialises the client and opens a &drm_file. Use drm_client_add() to complete the process.
  * The caller needs to hold a reference on @dev before calling this function.
  * The client is freed when the &drm_device is unregistered. See drm_client_release().
  *
  * Returns:
  * Zero on success or negative error code on failure.
  */
-int drm_client_new(struct drm_device *dev, struct drm_client_dev *client,
-		   const char *name, const struct drm_client_funcs *funcs)
+int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
+		    const char *name, const struct drm_client_funcs *funcs)
 {
 	int ret;
 
@@ -95,10 +96,6 @@ int drm_client_new(struct drm_device *dev, struct drm_client_dev *client,
 	if (ret)
 		goto err_put_module;
 
-	mutex_lock(&dev->clientlist_mutex);
-	list_add(&client->list, &dev->clientlist);
-	mutex_unlock(&dev->clientlist_mutex);
-
 	drm_dev_get(dev);
 
 	return 0;
@@ -109,13 +106,33 @@ err_put_module:
 
 	return ret;
 }
-EXPORT_SYMBOL(drm_client_new);
+EXPORT_SYMBOL(drm_client_init);
+
+/**
+ * drm_client_add - Add client to the device list
+ * @client: DRM client
+ *
+ * Add the client to the &drm_device client list to activate its callbacks.
+ * @client must be initialized by a call to drm_client_init(). After
+ * drm_client_add() it is no longer permissible to call drm_client_release()
+ * directly (outside the unregister callback), instead cleanup will happen
+ * automatically on driver unload.
+ */
+void drm_client_add(struct drm_client_dev *client)
+{
+	struct drm_device *dev = client->dev;
+
+	mutex_lock(&dev->clientlist_mutex);
+	list_add(&client->list, &dev->clientlist);
+	mutex_unlock(&dev->clientlist_mutex);
+}
+EXPORT_SYMBOL(drm_client_add);
 
 /**
  * drm_client_release - Release DRM client resources
  * @client: DRM client
  *
- * Releases resources by closing the &drm_file that was opened by drm_client_new().
+ * Releases resources by closing the &drm_file that was opened by drm_client_init().
  * It is called automatically if the &drm_client_funcs.unregister callback is _not_ set.
  *
  * This function should only be called from the unregister callback. An exception
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index 9da36a6271d3..9ac1f2e0f064 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -160,7 +160,7 @@ struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
 
 	fb_helper = &fbdev_cma->fb_helper;
 
-	ret = drm_client_new(dev, &fb_helper->client, "fbdev", NULL);
+	ret = drm_client_init(dev, &fb_helper->client, "fbdev", NULL);
 	if (ret)
 		goto err_free;
 
@@ -169,6 +169,8 @@ struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
 	if (ret)
 		goto err_client_put;
 
+	drm_client_add(&fb_helper->client);
+
 	return fbdev_cma;
 
 err_client_put:
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 16ec93b75dbf..515a7aec57ac 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -3218,12 +3218,14 @@ int drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
 	if (!fb_helper)
 		return -ENOMEM;
 
-	ret = drm_client_new(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
+	ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
 	if (ret) {
 		kfree(fb_helper);
 		return ret;
 	}
 
+	drm_client_add(&fb_helper->client);
+
 	fb_helper->preferred_bpp = preferred_bpp;
 
 	drm_fbdev_client_hotplug(&fb_helper->client);
diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index b54fb78a283c..b82da96ded5c 100644
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -566,14 +566,14 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
 	lessee_priv->is_master = 1;
 	lessee_priv->authenticated = 1;
 
-	/* Hook up the fd */
-	fd_install(fd, lessee_file);
-
 	/* Pass fd back to userspace */
 	DRM_DEBUG_LEASE("Returning fd %d id %d\n", fd, lessee->lessee_id);
 	cl->fd = fd;
 	cl->lessee_id = lessee->lessee_id;
 
+	/* Hook up the fd */
+	fd_install(fd, lessee_file);
+
 	DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl succeeded\n");
 	return 0;
 
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.h b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
index 87f6b5672e11..797d9ee5f15a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
@@ -55,37 +55,12 @@ static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
 static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
 					unsigned long start, unsigned long size)
 {
-	struct iommu_domain *domain;
-	int ret;
-
-	domain = iommu_domain_alloc(priv->dma_dev->bus);
-	if (!domain)
-		return -ENOMEM;
-
-	ret = iommu_get_dma_cookie(domain);
-	if (ret)
-		goto free_domain;
-
-	ret = iommu_dma_init_domain(domain, start, size, NULL);
-	if (ret)
-		goto put_cookie;
-
-	priv->mapping = domain;
+	priv->mapping = iommu_get_domain_for_dev(priv->dma_dev);
 	return 0;
-
-put_cookie:
-	iommu_put_dma_cookie(domain);
-free_domain:
-	iommu_domain_free(domain);
-	return ret;
 }
 
 static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
 {
-	struct iommu_domain *domain = priv->mapping;
-
-	iommu_put_dma_cookie(domain);
-	iommu_domain_free(domain);
 	priv->mapping = NULL;
 }
 
@@ -94,7 +69,9 @@ static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
 {
 	struct iommu_domain *domain = priv->mapping;
 
-	return iommu_attach_device(domain, dev);
+	if (dev != priv->dma_dev)
+		return iommu_attach_device(domain, dev);
+	return 0;
 }
 
 static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
@@ -102,7 +79,8 @@ static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
 {
 	struct iommu_domain *domain = priv->mapping;
 
-	iommu_detach_device(domain, dev);
+	if (dev != priv->dma_dev)
+		iommu_detach_device(domain, dev);
 }
 #else
 #error Unsupported architecture and IOMMU/DMA-mapping glue code
diff --git a/drivers/gpu/drm/i2c/tda9950.c b/drivers/gpu/drm/i2c/tda9950.c
index 5d2f0d548469..250b5e02a314 100644
--- a/drivers/gpu/drm/i2c/tda9950.c
+++ b/drivers/gpu/drm/i2c/tda9950.c
@@ -191,7 +191,8 @@ static irqreturn_t tda9950_irq(int irq, void *data)
 			break;
 		}
 		/* TDA9950 executes all retries for us */
-		tx_status |= CEC_TX_STATUS_MAX_RETRIES;
+		if (tx_status != CEC_TX_STATUS_OK)
+			tx_status |= CEC_TX_STATUS_MAX_RETRIES;
 		cec_transmit_done(priv->adap, tx_status, arb_lost_cnt,
 				  nack_cnt, 0, err_cnt);
 		break;
@@ -310,7 +311,7 @@ static void tda9950_release(struct tda9950_priv *priv)
 	/* Wait up to .5s for it to signal non-busy */
 	do {
 		csr = tda9950_read(client, REG_CSR);
-		if (!(csr & CSR_BUSY) || --timeout)
+		if (!(csr & CSR_BUSY) || !--timeout)
 			break;
 		msleep(10);
 	} while (1);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index f7f2aa71d8d9..a262a64f5625 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -232,6 +232,20 @@ static bool compress_init(struct compress *c)
 	return true;
 }
 
+static void *compress_next_page(struct drm_i915_error_object *dst)
+{
+	unsigned long page;
+
+	if (dst->page_count >= dst->num_pages)
+		return ERR_PTR(-ENOSPC);
+
+	page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
+	if (!page)
+		return ERR_PTR(-ENOMEM);
+
+	return dst->pages[dst->page_count++] = (void *)page;
+}
+
 static int compress_page(struct compress *c,
 			 void *src,
 			 struct drm_i915_error_object *dst)
@@ -245,19 +259,14 @@ static int compress_page(struct compress *c,
 
 	do {
 		if (zstream->avail_out == 0) {
-			unsigned long page;
-
-			page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
-			if (!page)
-				return -ENOMEM;
+			zstream->next_out = compress_next_page(dst);
+			if (IS_ERR(zstream->next_out))
+				return PTR_ERR(zstream->next_out);
 
-			dst->pages[dst->page_count++] = (void *)page;
-
-			zstream->next_out = (void *)page;
 			zstream->avail_out = PAGE_SIZE;
 		}
 
-		if (zlib_deflate(zstream, Z_SYNC_FLUSH) != Z_OK)
+		if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 			return -EIO;
 	} while (zstream->avail_in);
 
@@ -268,19 +277,42 @@ static int compress_page(struct compress *c,
 	return 0;
 }
 
-static void compress_fini(struct compress *c,
+static int compress_flush(struct compress *c,
 			  struct drm_i915_error_object *dst)
 {
 	struct z_stream_s *zstream = &c->zstream;
 
-	if (dst) {
-		zlib_deflate(zstream, Z_FINISH);
-		dst->unused = zstream->avail_out;
-	}
+	do {
+		switch (zlib_deflate(zstream, Z_FINISH)) {
+		case Z_OK: /* more space requested */
+			zstream->next_out = compress_next_page(dst);
+			if (IS_ERR(zstream->next_out))
+				return PTR_ERR(zstream->next_out);
+
+			zstream->avail_out = PAGE_SIZE;
+			break;
+
+		case Z_STREAM_END:
+			goto end;
+
+		default: /* any error */
+			return -EIO;
+		}
+	} while (1);
+
+end:
+	memset(zstream->next_out, 0, zstream->avail_out);
+	dst->unused = zstream->avail_out;
+	return 0;
+}
+
+static void compress_fini(struct compress *c,
+			  struct drm_i915_error_object *dst)
+{
+	struct z_stream_s *zstream = &c->zstream;
 
 	zlib_deflateEnd(zstream);
 	kfree(zstream->workspace);
-
 	if (c->tmp)
 		free_page((unsigned long)c->tmp);
 }
@@ -319,6 +351,12 @@ static int compress_page(struct compress *c,
 	return 0;
 }
 
+static int compress_flush(struct compress *c,
+			  struct drm_i915_error_object *dst)
+{
+	return 0;
+}
+
 static void compress_fini(struct compress *c,
 			  struct drm_i915_error_object *dst)
 {
@@ -917,6 +955,7 @@ i915_error_object_create(struct drm_i915_private *i915,
 	unsigned long num_pages;
 	struct sgt_iter iter;
 	dma_addr_t dma;
+	int ret;
 
 	if (!vma)
 		return NULL;
@@ -930,6 +969,7 @@ i915_error_object_create(struct drm_i915_private *i915,
 
 	dst->gtt_offset = vma->node.start;
 	dst->gtt_size = vma->node.size;
+	dst->num_pages = num_pages;
 	dst->page_count = 0;
 	dst->unused = 0;
 
@@ -938,28 +978,26 @@ i915_error_object_create(struct drm_i915_private *i915,
 		return NULL;
 	}
 
+	ret = -EINVAL;
 	for_each_sgt_dma(dma, iter, vma->pages) {
 		void __iomem *s;
-		int ret;
 
 		ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
 
 		s = io_mapping_map_atomic_wc(&ggtt->iomap, slot);
 		ret = compress_page(&compress, (void  __force *)s, dst);
 		io_mapping_unmap_atomic(s);
-
 		if (ret)
-			goto unwind;
+			break;
 	}
-	goto out;
 
-unwind:
-	while (dst->page_count--)
-		free_page((unsigned long)dst->pages[dst->page_count]);
-	kfree(dst);
-	dst = NULL;
+	if (ret || compress_flush(&compress, dst)) {
+		while (dst->page_count--)
+			free_page((unsigned long)dst->pages[dst->page_count]);
+		kfree(dst);
+		dst = NULL;
+	}
 
-out:
 	compress_fini(&compress, dst);
 	ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
 	return dst;
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h
index f893a4e8b783..8710fb18ed74 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.h
+++ b/drivers/gpu/drm/i915/i915_gpu_error.h
@@ -135,6 +135,7 @@ struct i915_gpu_state {
 		struct drm_i915_error_object {
 			u64 gtt_offset;
 			u64 gtt_size;
+			int num_pages;
 			int page_count;
 			int unused;
 			u32 *pages[0];
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 90628a47ae17..29877969310d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3091,36 +3091,27 @@ gen11_gt_irq_handler(struct drm_i915_private * const i915,
 	spin_unlock(&i915->irq_lock);
 }
 
-static void
-gen11_gu_misc_irq_ack(struct drm_i915_private *dev_priv, const u32 master_ctl,
-		      u32 *iir)
+static u32
+gen11_gu_misc_irq_ack(struct drm_i915_private *dev_priv, const u32 master_ctl)
 {
 	void __iomem * const regs = dev_priv->regs;
+	u32 iir;
 
 	if (!(master_ctl & GEN11_GU_MISC_IRQ))
-		return;
+		return 0;
+
+	iir = raw_reg_read(regs, GEN11_GU_MISC_IIR);
+	if (likely(iir))
+		raw_reg_write(regs, GEN11_GU_MISC_IIR, iir);
 
-	*iir = raw_reg_read(regs, GEN11_GU_MISC_IIR);
-	if (likely(*iir))
-		raw_reg_write(regs, GEN11_GU_MISC_IIR, *iir);
+	return iir;
 }
 
 static void
-gen11_gu_misc_irq_handler(struct drm_i915_private *dev_priv,
-			  const u32 master_ctl, const u32 iir)
+gen11_gu_misc_irq_handler(struct drm_i915_private *dev_priv, const u32 iir)
 {
-	if (!(master_ctl & GEN11_GU_MISC_IRQ))
-		return;
-
-	if (unlikely(!iir)) {
-		DRM_ERROR("GU_MISC iir blank!\n");
-		return;
-	}
-
 	if (iir & GEN11_GU_MISC_GSE)
 		intel_opregion_asle_intr(dev_priv);
-	else
-		DRM_ERROR("Unexpected GU_MISC interrupt 0x%x\n", iir);
 }
 
 static irqreturn_t gen11_irq_handler(int irq, void *arg)
@@ -3157,12 +3148,12 @@ static irqreturn_t gen11_irq_handler(int irq, void *arg)
 		enable_rpm_wakeref_asserts(i915);
 	}
 
-	gen11_gu_misc_irq_ack(i915, master_ctl, &gu_misc_iir);
+	gu_misc_iir = gen11_gu_misc_irq_ack(i915, master_ctl);
 
 	/* Acknowledge and enable interrupts. */
 	raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, GEN11_MASTER_IRQ | master_ctl);
 
-	gen11_gu_misc_irq_handler(i915, master_ctl, gu_misc_iir);
+	gen11_gu_misc_irq_handler(i915, gu_misc_iir);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 6a4d1388ad2d..1df3ce134cd0 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -592,7 +592,6 @@ static const struct intel_device_info intel_cannonlake_info = {
 	GEN10_FEATURES, \
 	GEN(11), \
 	.ddb_size = 2048, \
-	.has_csr = 0, \
 	.has_logical_ring_elsq = 1
 
 static const struct intel_device_info intel_icelake_11_info = {
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 0b976dfd04df..92ecb9bf982c 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -600,7 +600,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 	}
 
 	mtk_crtc->layer_nr = mtk_ddp_comp_layer_nr(mtk_crtc->ddp_comp[0]);
-	mtk_crtc->planes = devm_kzalloc(dev, mtk_crtc->layer_nr *
+	mtk_crtc->planes = devm_kcalloc(dev, mtk_crtc->layer_nr,
 					sizeof(struct drm_plane),
 					GFP_KERNEL);
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
index 790d39f816dc..b557687b1964 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_io_util.c
@@ -153,8 +153,8 @@ int msm_dss_parse_clock(struct platform_device *pdev,
 		return 0;
 	}
 
-	mp->clk_config = devm_kzalloc(&pdev->dev,
-				      sizeof(struct dss_clk) * num_clk,
+	mp->clk_config = devm_kcalloc(&pdev->dev,
+				      num_clk, sizeof(struct dss_clk),
 				      GFP_KERNEL);
 	if (!mp->clk_config)
 		return -ENOMEM;
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 5691dfa1db6f..041e7daf8a33 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -900,9 +900,22 @@ static enum drm_connector_status
 nv50_mstc_detect(struct drm_connector *connector, bool force)
 {
 	struct nv50_mstc *mstc = nv50_mstc(connector);
+	enum drm_connector_status conn_status;
+	int ret;
+
 	if (!mstc->port)
 		return connector_status_disconnected;
-	return drm_dp_mst_detect_port(connector, mstc->port->mgr, mstc->port);
+
+	ret = pm_runtime_get_sync(connector->dev->dev);
+	if (ret < 0 && ret != -EACCES)
+		return connector_status_disconnected;
+
+	conn_status = drm_dp_mst_detect_port(connector, mstc->port->mgr,
+					     mstc->port);
+
+	pm_runtime_mark_last_busy(connector->dev->dev);
+	pm_runtime_put_autosuspend(connector->dev->dev);
+	return conn_status;
 }
 
 static void