drm/exynos: resolve infinite loop issue on non multi-platform

This patch resovles the infinite loop issue incurred
when Exyno drm driver is enabled but all kms drivers
are disabled on Exynos board by returning -EPROBE_DEFER
only in case that there is kms device registered.

Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index d41aae0..b8abbc4 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -495,6 +495,12 @@ static struct component_match *exynos_drm_match_add(struct device *dev)
 
        mutex_lock(&drm_component_lock);
 
+       /* Do not retry to probe if there is no any kms driver regitered. */
+       if (list_empty(&drm_component_list)) {
+               mutex_unlock(&drm_component_lock);
+               return ERR_PTR(-ENODEV);
+       }
+
        list_for_each_entry(cdev, &drm_component_list, list) {
                /*
                 * Add components to master only in case that crtc and