[PATCH 4.17 05/67] drm/etnaviv: Check for platform_device_register_simple() failure

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fabio Estevam <fabio.este...@nxp.com>

commit 45a0faaba9c8c5ba1e31a08a391aed0bad327167 upstream.

platform_device_register_simple() may fail, so we should better
check its return value and propagate it in the case of error.

Cc: <sta...@vger.kernel.org>
Fixes: 246774d17fc0 ("drm/etnaviv: remove the need for a gpu-subsystem DT node")
Signed-off-by: Fabio Estevam <fabio.este...@nxp.com>
Reviewed-by: Philipp Zabel <p.za...@pengutronix.de>
Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/gpu/drm/etnaviv/etnaviv_drv.c |   21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -693,8 +693,11 @@ static struct platform_driver etnaviv_pl
        },
 };
 
+static struct platform_device *etnaviv_drm;
+
 static int __init etnaviv_init(void)
 {
+       struct platform_device *pdev;
        int ret;
        struct device_node *np;
 
@@ -706,7 +709,7 @@ static int __init etnaviv_init(void)
 
        ret = platform_driver_register(&etnaviv_platform_driver);
        if (ret != 0)
-               platform_driver_unregister(&etnaviv_gpu_driver);
+               goto unregister_gpu_driver;
 
        /*
         * If the DT contains at least one available GPU device, instantiate
@@ -715,12 +718,24 @@ static int __init etnaviv_init(void)
        for_each_compatible_node(np, NULL, "vivante,gc") {
                if (!of_device_is_available(np))
                        continue;
-
-               platform_device_register_simple("etnaviv", -1, NULL, 0);
+               pdev = platform_device_register_simple("etnaviv", -1,
+                                                      NULL, 0);
+               if (IS_ERR(pdev)) {
+                       ret = PTR_ERR(pdev);
+                       of_node_put(np);
+                       goto unregister_platform_driver;
+               }
+               etnaviv_drm = pdev;
                of_node_put(np);
                break;
        }
 
+       return 0;
+
+unregister_platform_driver:
+       platform_driver_unregister(&etnaviv_platform_driver);
+unregister_gpu_driver:
+       platform_driver_unregister(&etnaviv_gpu_driver);
        return ret;
 }
 module_init(etnaviv_init);