[v2,6/6] drm/tegra: Use u64_to_user_ptr helper

Message ID 20170905081029.19769-7-mperttunen@nvidia.com
State Changes Requested
Headers show
Series
  • Miscellaneous improvements to Host1x and TegraDRM
Related show

Commit Message

Mikko Perttunen Sept. 5, 2017, 8:10 a.m.
Use the u64_to_user_ptr helper macro to cast IOCTL argument u64 values
to user pointers instead of writing out the cast manually.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/gpu/drm/tegra/drm.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

Comments

Dmitry Osipenko Sept. 5, 2017, 12:41 p.m. | #1
On 05.09.2017 11:10, Mikko Perttunen wrote:
> Use the u64_to_user_ptr helper macro to cast IOCTL argument u64 values
> to user pointers instead of writing out the cast manually.
> 
> Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
> ---

This patch doesn't apply to linux-next, you should probably rebase this series.

>  drivers/gpu/drm/tegra/drm.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index e3331a2bc082..72d5c0021540 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -388,18 +388,21 @@ int tegra_drm_submit(struct tegra_drm_context *context,
>  	unsigned int num_cmdbufs = args->num_cmdbufs;
>  	unsigned int num_relocs = args->num_relocs;
>  	unsigned int num_waitchks = args->num_waitchks;
> -	struct drm_tegra_cmdbuf __user *cmdbufs =
> -		(void __user *)(uintptr_t)args->cmdbufs;
> -	struct drm_tegra_reloc __user *relocs =
> -		(void __user *)(uintptr_t)args->relocs;
> -	struct drm_tegra_waitchk __user *waitchks =
> -		(void __user *)(uintptr_t)args->waitchks;
> +	struct drm_tegra_cmdbuf __user *cmdbufs;
> +	struct drm_tegra_reloc __user *relocs;
> +	struct drm_tegra_waitchk __user *waitchks;
> +	struct drm_tegra_syncpt __user *user_syncpt;
>  	struct drm_tegra_syncpt syncpt;
>  	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
>  	struct host1x_syncpt *sp;
>  	struct host1x_job *job;
>  	int err;
>  
> +	cmdbufs = u64_to_user_ptr(args->cmdbufs);
> +	relocs = u64_to_user_ptr(args->relocs);
> +	waitchks = u64_to_user_ptr(args->waitchks);

What about to prefix these variables with 'user_' for consistency?

> +	user_syncpt = u64_to_user_ptr(args->syncpts);
> +
>  	/* We don't yet support other than one syncpt_incr struct per submit */
>  	if (args->num_syncpts != 1)
>  		return -EINVAL;
> @@ -520,8 +523,7 @@ int tegra_drm_submit(struct tegra_drm_context *context,
>  		}
>  	}
>  
> -	if (copy_from_user(&syncpt, (void __user *)(uintptr_t)args->syncpts,
> -			   sizeof(syncpt))) {
> +	if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
>  		err = -EFAULT;
>  		goto fail;
>  	}
>

Patch

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index e3331a2bc082..72d5c0021540 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -388,18 +388,21 @@  int tegra_drm_submit(struct tegra_drm_context *context,
 	unsigned int num_cmdbufs = args->num_cmdbufs;
 	unsigned int num_relocs = args->num_relocs;
 	unsigned int num_waitchks = args->num_waitchks;
-	struct drm_tegra_cmdbuf __user *cmdbufs =
-		(void __user *)(uintptr_t)args->cmdbufs;
-	struct drm_tegra_reloc __user *relocs =
-		(void __user *)(uintptr_t)args->relocs;
-	struct drm_tegra_waitchk __user *waitchks =
-		(void __user *)(uintptr_t)args->waitchks;
+	struct drm_tegra_cmdbuf __user *cmdbufs;
+	struct drm_tegra_reloc __user *relocs;
+	struct drm_tegra_waitchk __user *waitchks;
+	struct drm_tegra_syncpt __user *user_syncpt;
 	struct drm_tegra_syncpt syncpt;
 	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 	struct host1x_syncpt *sp;
 	struct host1x_job *job;
 	int err;
 
+	cmdbufs = u64_to_user_ptr(args->cmdbufs);
+	relocs = u64_to_user_ptr(args->relocs);
+	waitchks = u64_to_user_ptr(args->waitchks);
+	user_syncpt = u64_to_user_ptr(args->syncpts);
+
 	/* We don't yet support other than one syncpt_incr struct per submit */
 	if (args->num_syncpts != 1)
 		return -EINVAL;
@@ -520,8 +523,7 @@  int tegra_drm_submit(struct tegra_drm_context *context,
 		}
 	}
 
-	if (copy_from_user(&syncpt, (void __user *)(uintptr_t)args->syncpts,
-			   sizeof(syncpt))) {
+	if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
 		err = -EFAULT;
 		goto fail;
 	}