[PATCH] fbdev: omapfb: panel-dsi-cm: initialize lock before registering display

dsicm_probe() registers the display before initializing ddata->lock.
Once omapdss_register_display() publishes the display, another consumer
can reach a dsicm callback that takes this mutex while it is still
uninitialized.

Initialize the mutex before registering the display so the published
callbacks always see a valid lock.

Fixes: f76ee892a99e ("omapfb: copy omapdss & displays for omapfb")
Cc: stable@vger.kernel.org
Signed-off-by: Runyu Xiao <redacted>
---
 drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c b/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
index 1d75f27c6b80..ce1d4d5f4034 100644
--- a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
+++ b/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c

@@ -1151,14 +1151,14 @@ static int dsicm_probe(struct platform_device *pdev)
 	dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
 		OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
 
+	mutex_init(&ddata->lock);
+
 	r = omapdss_register_display(dssdev);
 	if (r) {
 		dev_err(dev, "Failed to register panel\n");
 		goto err_reg;
 	}
 
-	mutex_init(&ddata->lock);
-
 	atomic_set(&ddata->do_update, 0);
 
 	ddata->reset_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);

-- 
2.34.1