diff mbox series

[v3,11/11] memory: tegra186-emc: fix interconnect registration race

Message ID 20230320182441.11904-12-sumitg@nvidia.com
State New
Headers show
Series Tegra234 Memory interconnect support | expand

Commit Message

Sumit Gupta March 20, 2023, 6:24 p.m. UTC 
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: ("memory: tegra: add interconnect support for DRAM scaling in Tegra234")
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
---
 drivers/memory/tegra/tegra186-emc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

Comments

Krzysztof Kozlowski March 22, 2023, 5:50 p.m. UTC | #1 
On 20/03/2023 19:24, Sumit Gupta 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: ("memory: tegra: add interconnect support for DRAM scaling in Tegra234")

Same problem and also send it separately.

Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/drivers/memory/tegra/tegra186-emc.c b/drivers/memory/tegra/tegra186-emc.c
index 0d68a20fd376..a5a2bce01db4 100644
--- a/drivers/memory/tegra/tegra186-emc.c
+++ b/drivers/memory/tegra/tegra186-emc.c
@@ -207,15 +207,13 @@  static int tegra_emc_interconnect_init(struct tegra186_emc *emc)
 	emc->provider.xlate = tegra_emc_of_icc_xlate;
 	emc->provider.get_bw = tegra_emc_icc_get_init_bw;
 
-	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";
@@ -236,11 +234,13 @@  static int tegra_emc_interconnect_init(struct tegra186_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);