drm/omap: fix DMM driver (un)registration

At the moment the DMM driver is never unregistered, even if it's
registered in the omapdrm module's init function. This means we'll get
errors when reloading the omapdrm module.

Fix this by unregistering the DMM driver properly, and also change the
module init to fail if DMM driver cannot be registered, simplifying the
unregister path as we don't need to keep the state whether we registered
the DMM driver or not.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index df3e66416a305959121d35177027a83c440903c8..f16a07d1668deff7108fbd8005b2ed0c296e6e7c 100644 (file)
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -727,18 +727,33 @@ static struct platform_driver pdev = {
 
 static int __init omap_drm_init(void)
 {
+       int r;
+
        DBG("init");
-       if (platform_driver_register(&omap_dmm_driver)) {
-               /* we can continue on without DMM.. so not fatal */
-               dev_err(NULL, "DMM registration failed\n");
+
+       r = platform_driver_register(&omap_dmm_driver);
+       if (r) {
+               pr_err("DMM driver registration failed\n");
+               return r;
        }
-       return platform_driver_register(&pdev);
+
+       r = platform_driver_register(&pdev);
+       if (r) {
+               pr_err("omapdrm driver registration failed\n");
+               platform_driver_unregister(&omap_dmm_driver);
+               return r;
+       }
+
+       return 0;
 }
 
 static void __exit omap_drm_fini(void)
 {
        DBG("fini");
+
        platform_driver_unregister(&pdev);
+
+       platform_driver_unregister(&omap_dmm_driver);
 }
 
 /* need late_initcall() so we load after dss_driver's are loaded */