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

[Sinclair Yeh]

This series looks good to me:  Reviewed-by: Sinclair Yeh <syeh@xxxxxxxxxx>

Thanks!

On Fri, Sep 23, 2016 at 06:39:04PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> 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 !â
> 
> Thus fix the affected source code places.
> 
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> ---
>  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
>