| Message ID | 20230201101559.15529-18-johan+linaro@kernel.org |
|---|---|
| State | Superseded |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: 06f079816d4c ("memory: tegra-mc: Add 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> (or tell me if I should take it via memory-controllers) Best regards, Krzysztof
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; }
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> Signed-off-by: Johan Hovold <johan+linaro@kernel.org> --- drivers/memory/tegra/mc.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-)