memory: tegra: fix interconnect registration race

commit 5553055c62683ce339f9ef5fb2a26c8331485d68 upstream.

The current interconnect provider registration interface is inherently
racy as nodes are not added until the after adding the provider. This
can specifically cause racing DT lookups to fail.

Switch to using the new API where the provider is not registered until
after it has been fully initialised.

Fixes: 06f079816d4c ("memory: tegra-mc: Add interconnect framework")
Cc: stable@vger.kernel.org      # 5.11
Cc: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20230306075651.2449-18-johan+linaro@kernel.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index 2f7a58a..b38b565 100644 (file)
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -769,16 +769,12 @@ static int tegra_mc_interconnect_setup(struct tegra_mc *mc)
        mc->provider.aggregate = mc->soc->icc_ops->aggregate;
        mc->provider.xlate_extended = mc->soc->icc_ops->xlate_extended;
 
-       err = icc_provider_add(&mc->provider);
-       if (err)
-               return err;
+       icc_provider_init(&mc->provider);
 
        /* create Memory Controller node */
        node = icc_node_create(TEGRA_ICC_MC);
-       if (IS_ERR(node)) {
-               err = PTR_ERR(node);
-               goto del_provider;
-       }
+       if (IS_ERR(node))
+               return PTR_ERR(node);
 
        node->name = "Memory Controller";
        icc_node_add(node, &mc->provider);
@@ -805,12 +801,14 @@ static int tegra_mc_interconnect_setup(struct tegra_mc *mc)
                        goto remove_nodes;
        }
 
+       err = icc_provider_register(&mc->provider);
+       if (err)
+               goto remove_nodes;
+
        return 0;
 
 remove_nodes:
        icc_nodes_remove(&mc->provider);
-del_provider:
-       icc_provider_del(&mc->provider);
 
        return err;
 }