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[PATCH 0/3] drm/vmwgfx: Fine-tuning for 13 function implementations

Started bySF Markus Elfring <elfring@users.sourceforge.net>
First post2016-09-23 18:40 +0200
Last post2016-09-23 18:50 +0200
Articles 4 — 1 participant

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  [PATCH 0/3] drm/vmwgfx: Fine-tuning for 13 function implementations SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-23 18:40 +0200
    [PATCH 1/3] drm/vmwgfx: Use kmalloc_array() in  vmw_surface_define_ioctl() SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-23 18:40 +0200
    [PATCH 2/3] drm/vmwgfx: Use memdup_user() rather than duplicating its  implementation SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-23 18:40 +0200
    [PATCH 3/3] drm/vmwgfx: Adjust checks for null pointers in 13  functions SF Markus Elfring <elfring@users.sourceforge.net> - 2016-09-23 18:50 +0200

#1490308 — [PATCH 0/3] drm/vmwgfx: Fine-tuning for 13 function implementations

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2016-09-23 18:40 +0200
Subject[PATCH 0/3] drm/vmwgfx: Fine-tuning for 13 function implementations
Message-ID<skBG1-6fB-9@gated-at.bofh.it>
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Fri, 23 Sep 2016 18:24:32 +0200

A few update suggestions were taken into account
from static source code analysis.

Markus Elfring (3):
  Use kmalloc_array() in vmw_surface_define_ioctl()
  Use memdup_user() rather than duplicating its implementation
  Adjust checks for null pointers in 13 functions

 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 56 ++++++++++++++-------------------
 1 file changed, 23 insertions(+), 33 deletions(-)

-- 
2.10.0

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#1490311 — [PATCH 1/3] drm/vmwgfx: Use kmalloc_array() in vmw_surface_define_ioctl()

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2016-09-23 18:40 +0200
Subject[PATCH 1/3] drm/vmwgfx: Use kmalloc_array() in vmw_surface_define_ioctl()
Message-ID<skBG2-6fB-13@gated-at.bofh.it>
In reply to#1490308
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Thu, 22 Sep 2016 21:54:33 +0200

Multiplications for the size determination of memory allocations
indicated that array data structures should be processed.
Thus use the corresponding function "kmalloc_array".

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index c2a721a..f557549 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -763,14 +763,16 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 	memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));
 	srf->num_sizes = num_sizes;
 	user_srf->size = size;
-
-	srf->sizes = kmalloc(srf->num_sizes * sizeof(*srf->sizes), GFP_KERNEL);
+	srf->sizes = kmalloc_array(srf->num_sizes,
+				   sizeof(*srf->sizes),
+				   GFP_KERNEL);
 	if (unlikely(srf->sizes == NULL)) {
 		ret = -ENOMEM;
 		goto out_no_sizes;
 	}
-	srf->offsets = kmalloc(srf->num_sizes * sizeof(*srf->offsets),
-			       GFP_KERNEL);
+	srf->offsets = kmalloc_array(srf->num_sizes,
+				     sizeof(*srf->offsets),
+				     GFP_KERNEL);
 	if (unlikely(srf->offsets == NULL)) {
 		ret = -ENOMEM;
 		goto out_no_offsets;
-- 
2.10.0

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#1490312 — [PATCH 2/3] drm/vmwgfx: Use memdup_user() rather than duplicating its implementation

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2016-09-23 18:40 +0200
Subject[PATCH 2/3] drm/vmwgfx: Use memdup_user() rather than duplicating its implementation
Message-ID<skBG1-6fB-11@gated-at.bofh.it>
In reply to#1490308
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Fri, 23 Sep 2016 17:26:02 +0200

* Reuse existing functionality from memdup_user() instead of keeping
  duplicate source code.

* Try this copy operation before allocating memory for the data structure
  member "offsets".

* Delete the local variable "user_sizes" which became unnecessary
  with this refactoring.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index f557549..15504c6 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -700,7 +700,6 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 	struct drm_vmw_surface_create_req *req = &arg->req;
 	struct drm_vmw_surface_arg *rep = &arg->rep;
 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
-	struct drm_vmw_size __user *user_sizes;
 	int ret;
 	int i, j;
 	uint32_t cur_bo_offset;
@@ -763,11 +762,11 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 	memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));
 	srf->num_sizes = num_sizes;
 	user_srf->size = size;
-	srf->sizes = kmalloc_array(srf->num_sizes,
-				   sizeof(*srf->sizes),
-				   GFP_KERNEL);
-	if (unlikely(srf->sizes == NULL)) {
-		ret = -ENOMEM;
+	srf->sizes = memdup_user((struct drm_vmw_size __user *)(unsigned long)
+				 req->size_addr,
+				 sizeof(*srf->sizes) * srf->num_sizes);
+	if (IS_ERR(srf->sizes)) {
+		ret = PTR_ERR(srf->sizes);
 		goto out_no_sizes;
 	}
 	srf->offsets = kmalloc_array(srf->num_sizes,
@@ -778,16 +777,6 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 		goto out_no_offsets;
 	}
 
-	user_sizes = (struct drm_vmw_size __user *)(unsigned long)
-	    req->size_addr;
-
-	ret = copy_from_user(srf->sizes, user_sizes,
-			     srf->num_sizes * sizeof(*srf->sizes));
-	if (unlikely(ret != 0)) {
-		ret = -EFAULT;
-		goto out_no_copy;
-	}
-
 	srf->base_size = *srf->sizes;
 	srf->autogen_filter = SVGA3D_TEX_FILTER_NONE;
 	srf->multisample_count = 0;
-- 
2.10.0

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#1490314 — [PATCH 3/3] drm/vmwgfx: Adjust checks for null pointers in 13 functions

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2016-09-23 18:50 +0200
Subject[PATCH 3/3] drm/vmwgfx: Adjust checks for null pointers in 13 functions
Message-ID<skBPI-6j6-7@gated-at.bofh.it>
In reply to#1490308
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Fri, 23 Sep 2016 17:53:49 +0200
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The script "checkpatch.pl" can point information out like the following.

Comparison to NULL could be written !…

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 15504c6..b445ce9 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -324,7 +324,7 @@ static void vmw_hw_surface_destroy(struct vmw_resource *res)
 	if (res->id != -1) {
 
 		cmd = vmw_fifo_reserve(dev_priv, vmw_surface_destroy_size());
-		if (unlikely(cmd == NULL)) {
+		if (unlikely(!cmd)) {
 			DRM_ERROR("Failed reserving FIFO space for surface "
 				  "destruction.\n");
 			return;
@@ -397,7 +397,7 @@ static int vmw_legacy_srf_create(struct vmw_resource *res)
 
 	submit_size = vmw_surface_define_size(srf);
 	cmd = vmw_fifo_reserve(dev_priv, submit_size);
-	if (unlikely(cmd == NULL)) {
+	if (unlikely(!cmd)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "creation.\n");
 		ret = -ENOMEM;
@@ -446,11 +446,10 @@ static int vmw_legacy_srf_dma(struct vmw_resource *res,
 	uint8_t *cmd;
 	struct vmw_private *dev_priv = res->dev_priv;
 
-	BUG_ON(val_buf->bo == NULL);
-
+	BUG_ON(!val_buf->bo);
 	submit_size = vmw_surface_dma_size(srf);
 	cmd = vmw_fifo_reserve(dev_priv, submit_size);
-	if (unlikely(cmd == NULL)) {
+	if (unlikely(!cmd)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "DMA.\n");
 		return -ENOMEM;
@@ -538,7 +537,7 @@ static int vmw_legacy_srf_destroy(struct vmw_resource *res)
 
 	submit_size = vmw_surface_destroy_size();
 	cmd = vmw_fifo_reserve(dev_priv, submit_size);
-	if (unlikely(cmd == NULL)) {
+	if (unlikely(!cmd)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "eviction.\n");
 		return -ENOMEM;
@@ -578,7 +577,7 @@ static int vmw_surface_init(struct vmw_private *dev_priv,
 	int ret;
 	struct vmw_resource *res = &srf->res;
 
-	BUG_ON(res_free == NULL);
+	BUG_ON(!res_free);
 	if (!dev_priv->has_mob)
 		vmw_fifo_resource_inc(dev_priv);
 	ret = vmw_resource_init(dev_priv, res, true, res_free,
@@ -747,7 +746,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 	}
 
 	user_srf = kzalloc(sizeof(*user_srf), GFP_KERNEL);
-	if (unlikely(user_srf == NULL)) {
+	if (unlikely(!user_srf)) {
 		ret = -ENOMEM;
 		goto out_no_user_srf;
 	}
@@ -772,7 +771,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 	srf->offsets = kmalloc_array(srf->num_sizes,
 				     sizeof(*srf->offsets),
 				     GFP_KERNEL);
-	if (unlikely(srf->offsets == NULL)) {
+	if (unlikely(!srf->offsets)) {
 		ret = -ENOMEM;
 		goto out_no_offsets;
 	}
@@ -914,7 +913,7 @@ vmw_surface_handle_reference(struct vmw_private *dev_priv,
 
 	ret = -EINVAL;
 	base = ttm_base_object_lookup_for_ref(dev_priv->tdev, handle);
-	if (unlikely(base == NULL)) {
+	if (unlikely(!base)) {
 		DRM_ERROR("Could not find surface to reference.\n");
 		goto out_no_lookup;
 	}
@@ -1060,7 +1059,7 @@ static int vmw_gb_surface_create(struct vmw_resource *res)
 
 	cmd = vmw_fifo_reserve(dev_priv, submit_len);
 	cmd2 = (typeof(cmd2))cmd;
-	if (unlikely(cmd == NULL)) {
+	if (unlikely(!cmd)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "creation.\n");
 		ret = -ENOMEM;
@@ -1126,7 +1125,7 @@ static int vmw_gb_surface_bind(struct vmw_resource *res,
 	submit_size = sizeof(*cmd1) + (res->backup_dirty ? sizeof(*cmd2) : 0);
 
 	cmd1 = vmw_fifo_reserve(dev_priv, submit_size);
-	if (unlikely(cmd1 == NULL)) {
+	if (unlikely(!cmd1)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "binding.\n");
 		return -ENOMEM;
@@ -1176,7 +1175,7 @@ static int vmw_gb_surface_unbind(struct vmw_resource *res,
 
 	submit_size = sizeof(*cmd3) + (readback ? sizeof(*cmd1) : sizeof(*cmd2));
 	cmd = vmw_fifo_reserve(dev_priv, submit_size);
-	if (unlikely(cmd == NULL)) {
+	if (unlikely(!cmd)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "unbinding.\n");
 		return -ENOMEM;
@@ -1235,7 +1234,7 @@ static int vmw_gb_surface_destroy(struct vmw_resource *res)
 	vmw_binding_res_list_scrub(&res->binding_head);
 
 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
-	if (unlikely(cmd == NULL)) {
+	if (unlikely(!cmd)) {
 		DRM_ERROR("Failed reserving FIFO space for surface "
 			  "destruction.\n");
 		mutex_unlock(&dev_priv->binding_mutex);
@@ -1401,7 +1400,7 @@ int vmw_gb_surface_reference_ioctl(struct drm_device *dev, void *data,
 
 	user_srf = container_of(base, struct vmw_user_surface, prime.base);
 	srf = &user_srf->srf;
-	if (srf->res.backup == NULL) {
+	if (!srf->res.backup) {
 		DRM_ERROR("Shared GB surface is missing a backup buffer.\n");
 		goto out_bad_resource;
 	}
@@ -1515,7 +1514,7 @@ int vmw_surface_gb_priv_define(struct drm_device *dev,
 	}
 
 	user_srf = kzalloc(sizeof(*user_srf), GFP_KERNEL);
-	if (unlikely(user_srf == NULL)) {
+	if (unlikely(!user_srf)) {
 		ret = -ENOMEM;
 		goto out_no_user_srf;
 	}
-- 
2.10.0

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