The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 5553055c62683ce339f9ef5fb2a26c8331485d68 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '167930617133113@kroah.com' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

5553055c6268 ("memory: tegra: fix interconnect registration race") 77b14c9d05bd ("memory: tegra: Remove interconnect state syncing hack")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5553055c62683ce339f9ef5fb2a26c8331485d68 Mon Sep 17 00:00:00 2001 From: Johan Hovold johan+linaro@kernel.org Date: Mon, 6 Mar 2023 08:56:45 +0100 Subject: [PATCH] memory: tegra: fix interconnect registration race

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

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c index 592907546ee6..5cd28619ea9f 100644 --- a/drivers/memory/tegra/mc.c +++ b/drivers/memory/tegra/mc.c @@ -794,16 +794,12 @@ 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); @@ -830,12 +826,14 @@ 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; }