linux-kernel - [PATCH] drm/tegra: fix non-debugfs builds

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Date:   Mon, 18 Dec 2017 14:44:46 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/tegra: fix non-debugfs builds

The new debugfs registration fails to build when CONFIG_DEBUGFS is
disabled, because the drm_crtc structure is lacking a member in that
configuration:

drivers/gpu/drm/tegra/dc.c: In function 'tegra_dc_late_register':
drivers/gpu/drm/tegra/dc.c:1204:28: error: 'struct drm_crtc' has no member named 'debugfs_entry'

Without CONFIG_DEBUGFS, the rest of the function already degrades
into nothing, so we just avoid the one assignment.

Fixes: b95800eeef09 ("drm/tegra: dc: Register debugfs in ->late_register()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/tegra/dc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index e963e40d8a25..e8a0cad5899c 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1201,10 +1201,16 @@ static int tegra_dc_late_register(struct drm_crtc *crtc)
 {
 	unsigned int i, count = ARRAY_SIZE(debugfs_files);
 	struct drm_minor *minor = crtc->dev->primary;
-	struct dentry *root = crtc->debugfs_entry;
+	struct dentry *root;
 	struct tegra_dc *dc = to_tegra_dc(crtc);
 	int err;
 
+#ifdef CONFIG_DEBUG_FS
+	root = crtc->debugfs_entry;
+#else
+	root = NULL;
+#endif
+
 	dc->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files),
 				    GFP_KERNEL);
 	if (!dc->debugfs_files)
-- 
2.9.0