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

From: Inki Dae <inki.dae@samsung.com>
To: airlied@linux.ie, dri-devel@lists.freedesktop.org
Cc: linux-samsung-soc@vger.kernel.org
Subject: [PATCH] drm/exynos: resolve infinite loop issue on non multi-platform
Date: Thu, 06 Nov 2014 23:10:07 +0900	[thread overview]
Message-ID: <1415283007-10096-1-git-send-email-inki.dae@samsung.com> (raw)

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>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index ecc86aa..14c6af7 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -488,6 +488,12 @@ 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
-- 
1.7.9.5

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