[PATCH v2] drm/meson: clean up KMS polling on register failure

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: [email protected]
Co-developed-by: Ijae Kim <[email protected]>
Signed-off-by: Ijae Kim <[email protected]>
Signed-off-by: Myeonghun Pak <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
---
Changes in v2:
- Avoid the unused uninstall_irq label reported by the kernel test robot.
- Link to v1: https://lore.kernel.org/r/[email protected]

 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..bcc36f2cdc 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -351,8 +351,10 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	platform_set_drvdata(pdev, priv);
 
 	ret = drm_dev_register(drm, 0);
-	if (ret)
+	if (ret) {
+		drm_kms_helper_poll_fini(drm);
 		goto uninstall_irq;
+	}
 
 	drm_client_setup(drm, NULL);
 
-- 
2.47.1