drm: Print the pid when debug logging an ioctl error.

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>

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index b1e96fb..af78291 100644 (file)
--- 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);