memory: tegra124-emc: fix interconnect registration race

commit 8ddc321d362c3ac8576e83c493e8e620425ec4ae 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: 851f5b26eb09 ("memory: tegra124: Support interconnect framework")
Cc: stable@vger.kernel.org      # 5.12
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/20230306075651.2449-19-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/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 85bc936c02f9401eb71b11e070757345c9b45553..00ed2b6a0d1b27e0466bd2ab14e82b7efc6c1ae0 100644 (file)
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -1351,15 +1351,13 @@ static int tegra_emc_interconnect_init(struct tegra_emc *emc)
        emc->provider.aggregate = soc->icc_ops->aggregate;
        emc->provider.xlate_extended = emc_of_icc_xlate_extended;
 
-       err = icc_provider_add(&emc->provider);
-       if (err)
-               goto err_msg;
+       icc_provider_init(&emc->provider);
 
        /* create External Memory Controller node */
        node = icc_node_create(TEGRA_ICC_EMC);
        if (IS_ERR(node)) {
                err = PTR_ERR(node);
-               goto del_provider;
+               goto err_msg;
        }
 
        node->name = "External Memory Controller";
@@ -1380,12 +1378,14 @@ static int tegra_emc_interconnect_init(struct tegra_emc *emc)
        node->name = "External Memory (DRAM)";
        icc_node_add(node, &emc->provider);
 
+       err = icc_provider_register(&emc->provider);
+       if (err)
+               goto remove_nodes;
+
        return 0;
 
 remove_nodes:
        icc_nodes_remove(&emc->provider);
-del_provider:
-       icc_provider_del(&emc->provider);
 err_msg:
        dev_err(emc->dev, "failed to initialize ICC: %d\n", err);