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 c5587f61ec050f7e9ebb3e2da29d12af63e833d3 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '1679306197240100@kroah.com' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
c5587f61ec05 ("memory: tegra20-emc: fix interconnect registration race")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c5587f61ec050f7e9ebb3e2da29d12af63e833d3 Mon Sep 17 00:00:00 2001 From: Johan Hovold johan+linaro@kernel.org Date: Mon, 6 Mar 2023 08:56:47 +0100 Subject: [PATCH] memory: tegra20-emc: 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: d5ef16ba5fbe ("memory: tegra20: Support 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/20230306075651.2449-20-johan+linaro@kernel.org Signed-off-by: Georgi Djakov djakov@kernel.org
diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c index bd4e37b6552d..fd595c851a27 100644 --- a/drivers/memory/tegra/tegra20-emc.c +++ b/drivers/memory/tegra/tegra20-emc.c @@ -1021,15 +1021,13 @@ 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"; @@ -1050,12 +1048,14 @@ 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);