From reviewing the code, the line
  memset(kdata, 0, usize);
is not needed because kdata is either zeroed by
  kdata = kzalloc(asize, GFP_KERNEL);
when allocated at runtime or by
  char stack_kdata[128] = {0};
at compile time.

Signed-off-by: Tom Rix <trix@redhat.com>
---
 drivers/accel/habanalabs/common/habanalabs_ioctl.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/accel/habanalabs/common/habanalabs_ioctl.c b/drivers/accel/habanalabs/common/habanalabs_ioctl.c
index 619d56c40b30..949d38527160 100644
--- a/drivers/accel/habanalabs/common/habanalabs_ioctl.c
+++ b/drivers/accel/habanalabs/common/habanalabs_ioctl.c
@@ -1123,8 +1123,6 @@ static long _hl_ioctl(struct file *filep, unsigned int cmd, unsigned long arg,
 			retcode = -EFAULT;
 			goto out_err;
 		}
-	} else if (cmd & IOC_OUT) {
-		memset(kdata, 0, usize);
 	}
 
 	retcode = func(hpriv, kdata);
-- 
2.27.0

On Sat, Jan 7, 2023 at 8:48 PM Tom Rix <trix@redhat.com> wrote:
>
> From reviewing the code, the line
>   memset(kdata, 0, usize);
> is not needed because kdata is either zeroed by
>   kdata = kzalloc(asize, GFP_KERNEL);
> when allocated at runtime or by
>   char stack_kdata[128] = {0};
> at compile time.
>
> Signed-off-by: Tom Rix <trix@redhat.com>
> ---
>  drivers/accel/habanalabs/common/habanalabs_ioctl.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/accel/habanalabs/common/habanalabs_ioctl.c b/drivers/accel/habanalabs/common/habanalabs_ioctl.c
> index 619d56c40b30..949d38527160 100644
> --- a/drivers/accel/habanalabs/common/habanalabs_ioctl.c
> +++ b/drivers/accel/habanalabs/common/habanalabs_ioctl.c
> @@ -1123,8 +1123,6 @@ static long _hl_ioctl(struct file *filep, unsigned int cmd, unsigned long arg,
>                         retcode = -EFAULT;
>                         goto out_err;
>                 }
> -       } else if (cmd & IOC_OUT) {
> -               memset(kdata, 0, usize);
>         }
>
>         retcode = func(hpriv, kdata);
> --
> 2.27.0
>

Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Applied to -next.

Thanks,
Oded