[PATCH] drm/meson: clean up KMS polling on register failure

[Myeonghun Pak]

meson_drv_bind_master() starts the KMS polling helper before registering
the DRM device. If drm_dev_register() fails, probe unwinds the IRQ and
DRM device without stopping the polling helper.

Call drm_kms_helper_poll_fini() on that failure path before freeing the
IRQ.

This issue was identified during our ongoing static-analysis research while
reviewing kernel code.

Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")
Cc: stable@xxxxxxxxxxxxxxx
Co-developed-by: Ijae Kim <ae878000@xxxxxxxxx>
Signed-off-by: Ijae Kim <ae878000@xxxxxxxxx>
Signed-off-by: Myeonghun Pak <mhun512@xxxxxxxxx>
---
 drivers/gpu/drm/meson/meson_drv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 49ff9f1f16..e49de5df73 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -352,12 +352,14 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 
 	ret = drm_dev_register(drm, 0);
 	if (ret)
-		goto uninstall_irq;
+		goto uninstall_poll;
 
 	drm_client_setup(drm, NULL);
 
 	return 0;
 
+uninstall_poll:
+	drm_kms_helper_poll_fini(drm);
 uninstall_irq:
 	free_irq(priv->vsync_irq, drm);
 exit_afbcd:
-- 
2.47.1