| Message ID | 20230201101559.15529-20-johan+linaro@kernel.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | interconnect: fix racy provider registration | expand |
On 01/02/2023 11:15, Johan Hovold wrote: > 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> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Best regards, Krzysztof
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);
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> Signed-off-by: Johan Hovold <johan+linaro@kernel.org> --- drivers/memory/tegra/tegra20-emc.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)