[PATCH] drm: Avoid calling dev_printk(.dev = NULL)

[Chris Wilson]

Since dev_printk likes to print "(NULL device *):" when passed in a NULL
pointer, we have to manually call printk() ourselves.

Fixes: c4e68a583202 ("drm: Introduce DRM_DEV_* log messages")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Eric Engestrom <eric.engestrom at imgtec.com>
Cc: Sean Paul <seanpaul at chromium.org>
---
 drivers/gpu/drm/drm_drv.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index a7f628298365..acf6a5f38920 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -79,8 +79,11 @@ void drm_dev_printk(const struct device *dev, const char 
*level,
        vaf.fmt = format;
        vaf.va = &args;

-       dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix,
-                  &vaf);
+       if (dev)
+               dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix,
+                          &vaf);
+       else
+               printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf);

        va_end(args);
 }
-- 
2.9.3