FAILED: patch "[PATCH] PCI: cadence: Store the core controller in platform drvdata" failed to apply to 6.18-stable tree

FAILED: patch "[PATCH] PCI: cadence: Store the core controller in platform drvdata" failed to apply to 6.18-stable tree

[Sasha Levin]

The patch below does not apply to the 6.18-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-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x cfe96ce583c51bf6e034d4038c652a1e8227867c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107051138-failed-6.18-cfe96ce583c5@kernel.org' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Thanks,
Sasha

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

From cfe96ce583c51bf6e034d4038c652a1e8227867c Mon Sep 17 00:00:00 2001
From: Linmao Li <lilinmao@kylinos.cn>
Date: Tue, 15 Sep 2026 16:28:26 +0800
Subject: [PATCH] PCI: cadence: Store the core controller in platform drvdata

cdns_plat_pcie_probe() stores a struct cdns_plat_pcie pointer with
platform_set_drvdata(). cdns_plat_pcie_shutdown() and the callbacks in
cdns_pcie_pm_ops retrieve the same pointer with dev_get_drvdata() but use
it as a struct cdns_pcie pointer. This makes them read phy_count and phy
beyond the wrapper.

struct cdns_plat_pcie only contains a pointer to struct cdns_pcie. Drop
the redundant wrapper and store the struct cdns_pcie pointer directly.

Fixes: bd22885aa188 ("PCI: cadence: Refactor driver to use as a core library")
Signed-off-by: Linmao Li <lilinmao@kylinos.cn>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Aksh Garg <a-garg7@ti.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260915082826.4135665-1-lilinmao@kylinos.cn
---
 .../controller/cadence/pcie-cadence-plat.c    | 27 ++++++-------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/pci/controller/cadence/pcie-cadence-plat.c b/drivers/pci/controller/cadence/pcie-cadence-plat.c
index 13edc6be21f59..4a24302cc5b2c 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-plat.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-plat.c
@@ -14,14 +14,6 @@
 
 #define CDNS_PLAT_CPU_TO_BUS_ADDR	0x0FFFFFFF
 
-/**
- * struct cdns_plat_pcie - private data for this PCIe platform driver
- * @pcie: Cadence PCIe controller
- */
-struct cdns_plat_pcie {
-	struct cdns_pcie        *pcie;
-};
-
 static const struct of_device_id cdns_plat_pcie_of_match[];
 
 static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
@@ -36,9 +28,9 @@ static const struct cdns_pcie_ops cdns_plat_ops = {
 static int cdns_plat_pcie_probe(struct platform_device *pdev)
 {
 	const struct cdns_plat_pcie_of_data *data;
-	struct cdns_plat_pcie *cdns_plat_pcie;
 	struct device *dev = &pdev->dev;
 	struct pci_host_bridge *bridge;
+	struct cdns_pcie *pcie;
 	struct cdns_pcie_ep *ep;
 	struct cdns_pcie_rc *rc;
 	bool is_rc;
@@ -51,11 +43,6 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 	is_rc = data->is_rc;
 
 	pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
-	cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
-	if (!cdns_plat_pcie)
-		return -ENOMEM;
-
-	platform_set_drvdata(pdev, cdns_plat_pcie);
 	if (is_rc) {
 		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
 			return -ENODEV;
@@ -67,9 +54,9 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 		rc = pci_host_bridge_priv(bridge);
 		rc->pcie.dev = dev;
 		rc->pcie.ops = &cdns_plat_ops;
-		cdns_plat_pcie->pcie = &rc->pcie;
+		pcie = &rc->pcie;
 
-		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
+		ret = cdns_pcie_init_phy(dev, pcie);
 		if (ret) {
 			dev_err(dev, "failed to init phy\n");
 			return ret;
@@ -94,9 +81,9 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 
 		ep->pcie.dev = dev;
 		ep->pcie.ops = &cdns_plat_ops;
-		cdns_plat_pcie->pcie = &ep->pcie;
+		pcie = &ep->pcie;
 
-		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
+		ret = cdns_pcie_init_phy(dev, pcie);
 		if (ret) {
 			dev_err(dev, "failed to init phy\n");
 			return ret;
@@ -114,13 +101,15 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 			goto err_init;
 	}
 
+	platform_set_drvdata(pdev, pcie);
+
 	return 0;
 
  err_init:
  err_get_sync:
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
-	cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
+	cdns_pcie_disable_phy(pcie);
 
 	return ret;
 }
-- 
2.53.0

[PATCH 6.18.y] PCI: cadence: Store the core controller in platform drvdata

[Sasha Levin]

From: Linmao Li <lilinmao@kylinos.cn>

[ Upstream commit cfe96ce583c51bf6e034d4038c652a1e8227867c ]

cdns_plat_pcie_probe() stores a struct cdns_plat_pcie pointer with
platform_set_drvdata(). cdns_plat_pcie_shutdown() and the callbacks in
cdns_pcie_pm_ops retrieve the same pointer with dev_get_drvdata() but use
it as a struct cdns_pcie pointer. This makes them read phy_count and phy
beyond the wrapper.

struct cdns_plat_pcie only contains a pointer to struct cdns_pcie. Drop
the redundant wrapper and store the struct cdns_pcie pointer directly.

Fixes: bd22885aa188 ("PCI: cadence: Refactor driver to use as a core library")
Signed-off-by: Linmao Li <lilinmao@kylinos.cn>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Aksh Garg <a-garg7@ti.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260915082826.4135665-1-lilinmao@kylinos.cn
[ sashal: adapted the retained PHY-link cleanup loop to use pcie directly instead of the removed wrapper ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../controller/cadence/pcie-cadence-plat.c    | 33 +++++++------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/pci/controller/cadence/pcie-cadence-plat.c b/drivers/pci/controller/cadence/pcie-cadence-plat.c
index 0456845dabb96..c1ec619ab0a4e 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-plat.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-plat.c
@@ -14,14 +14,6 @@
 
 #define CDNS_PLAT_CPU_TO_BUS_ADDR	0x0FFFFFFF
 
-/**
- * struct cdns_plat_pcie - private data for this PCIe platform driver
- * @pcie: Cadence PCIe controller
- */
-struct cdns_plat_pcie {
-	struct cdns_pcie        *pcie;
-};
-
 struct cdns_plat_pcie_of_data {
 	bool is_rc;
 };
@@ -40,9 +32,9 @@ static const struct cdns_pcie_ops cdns_plat_ops = {
 static int cdns_plat_pcie_probe(struct platform_device *pdev)
 {
 	const struct cdns_plat_pcie_of_data *data;
-	struct cdns_plat_pcie *cdns_plat_pcie;
 	struct device *dev = &pdev->dev;
 	struct pci_host_bridge *bridge;
+	struct cdns_pcie *pcie;
 	struct cdns_pcie_ep *ep;
 	struct cdns_pcie_rc *rc;
 	int phy_count;
@@ -56,11 +48,6 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 	is_rc = data->is_rc;
 
 	pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
-	cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
-	if (!cdns_plat_pcie)
-		return -ENOMEM;
-
-	platform_set_drvdata(pdev, cdns_plat_pcie);
 	if (is_rc) {
 		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
 			return -ENODEV;
@@ -72,9 +59,9 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 		rc = pci_host_bridge_priv(bridge);
 		rc->pcie.dev = dev;
 		rc->pcie.ops = &cdns_plat_ops;
-		cdns_plat_pcie->pcie = &rc->pcie;
+		pcie = &rc->pcie;
 
-		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
+		ret = cdns_pcie_init_phy(dev, pcie);
 		if (ret) {
 			dev_err(dev, "failed to init phy\n");
 			return ret;
@@ -99,9 +86,9 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 
 		ep->pcie.dev = dev;
 		ep->pcie.ops = &cdns_plat_ops;
-		cdns_plat_pcie->pcie = &ep->pcie;
+		pcie = &ep->pcie;
 
-		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
+		ret = cdns_pcie_init_phy(dev, pcie);
 		if (ret) {
 			dev_err(dev, "failed to init phy\n");
 			return ret;
@@ -119,18 +106,20 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 			goto err_init;
 	}
 
+	platform_set_drvdata(pdev, pcie);
+
 	return 0;
 
  err_init:
  err_get_sync:
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
-	cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
-	phy_count = cdns_plat_pcie->pcie->phy_count;
+	cdns_pcie_disable_phy(pcie);
+	phy_count = pcie->phy_count;
 	while (phy_count--)
-		device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
+		device_link_del(pcie->link[phy_count]);
 
-	return 0;
+	return ret;
 }
 
 static void cdns_plat_pcie_shutdown(struct platform_device *pdev)
-- 
2.53.0