drm/sun4i: fix refcount leak in sun4i_backend_init_sat()

When sun4i_backend_init_sat() calls reset_control_deassert() it
increments the deassert_count of the reset controller, and must
pair that with a reset_control_assert() call to decrement it.
In the error path where clk_prepare_enable() fails, the function
returns immediately without calling reset_control_assert(), leaking
the reference count.  Other error paths, like the devm_clk_get()
failure, correctly jump to the err_assert_reset label which performs
the missing assert.

Fix the leak by using the existing err_assert_reset label in the
clk_prepare_enable error path instead of returning directly.

Cc: stable@vger.kernel.org
Fixes: 440d2c7b127a ("drm/sun4i: backend: Handle the SAT")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20260607030950.83636-1-vulab@iscas.ac.cn
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>

diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index 03e46a2af6463902d77b124b432e191d68f0b332..adf5b6e09ca647e665b5ba6c55c462e0a2b2bc79 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -686,7 +686,7 @@ static int sun4i_backend_init_sat(struct device *dev) {
        ret = clk_prepare_enable(backend->sat_clk);
        if (ret) {
                dev_err(dev, "Couldn't enable the SAT clock\n");
-               return ret;
+               goto err_assert_reset;
        }
 
        return 0;