[Intel-gfx] [PATCH] Warn when inteldrmfb fails to restore its framebuffer config

[Ben Gamari]

While sifting through the inteldrmfb code trying to solve #22040 I found that
the fb restore path doesn't check the return value of
drm_crtc_helper_set_config(), which seems to have all sorts of potential
failure modes. We should warn someone if one of these is triggered.

Signed-Off-By: Ben Gamari <bgamari.foss at gmail.com>

---
 drivers/gpu/drm/i915/intel_fb.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_fb.c b/drivers/gpu/drm/i915/intel_fb.c
index 1e1aeb0..a7cf662 100644
--- a/drivers/gpu/drm/i915/intel_fb.c
+++ b/drivers/gpu/drm/i915/intel_fb.c
@@ -854,7 +854,10 @@ static int intelfb_single_fb_probe(struct drm_device *dev)
  */
 void intelfb_restore(void)
 {
-	drm_crtc_helper_set_config(&kernelfb_mode);
+	int ret;
+	if ((ret = drm_crtc_helper_set_config(&kernelfb_mode)) != 0)
+		printk(KERN_ERR "Failed to restore crtc configuration: %d\n", ret);
+	
 }
 
 static void intelfb_sysrq(int dummy1, struct tty_struct *dummy3)
-- 
1.6.3.1