From: Eric Anholt <eric@anholt.net>
Date: Tue, 30 Jan 2018 13:56:43 -0800
Subject: drm: Print the pid when debug logging an ioctl error.
Git-commit: 9c950e468cb5913d223282a05e6cd22fecce5ac8
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

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@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20180130215643.11016-1-eric@anholt.net
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/drm_ioctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -848,7 +848,7 @@ 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);