Re: [PATCH] drm: Print the pid when debug logging an ioctl error.

[Daniel Vetter]

On Tue, Jan 30, 2018 at 01:56:43PM -0800, Eric Anholt wrote:
> When we debug print what ioctl we're calling into, we include the pid.
> If you have multiple processes rendering simulataneously, the error
> return also needs the pid so you can see which of the ioctl calls was
> the one to fail.
> 
> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> ---
>  drivers/gpu/drm/drm_ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index a9ae6dd2d593..38c302607738 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -842,7 +842,7 @@ long drm_ioctl(struct file *filp,
>  	if (kdata != stack_kdata)
>  		kfree(kdata);
>  	if (retcode)
> -		DRM_DEBUG("ret = %d\n", retcode);
> +		DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode);
>  	return retcode;
>  }
>  EXPORT_SYMBOL(drm_ioctl);
> -- 
> 2.15.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch