linux-kernel - [PATCH 03/11] PCI: dwc: Add dw_pcie_free

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Message-ID: <20250903124505.365913-4-s-vadapalli@ti.com>
Date: Wed, 3 Sep 2025 18:14:44 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>, <mani@...nel.org>,
        <robh@...nel.org>, <bhelgaas@...gle.com>, <jingoohan1@...il.com>,
        <fan.ni@...sung.com>, <quic_wenbyao@...cinc.com>,
        <namcao@...utronix.de>, <mayank.rana@....qualcomm.com>,
        <thippeswamy.havalige@....com>, <quic_schintav@...cinc.com>,
        <shradha.t@...sung.com>, <inochiama@...il.com>, <cassel@...nel.org>,
        <kishon@...nel.org>, <18255117159@....com>, <rongqianfeng@...o.com>,
        <jirislaby@...nel.org>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH 03/11] PCI: dwc: Add dw_pcie_free_domains() helper for cleanup

Introduce the helper function dw_pcie_free_domains() which will undo the
allocation performed by the dw_pcie_allocate_domains() function. Export
this helper for the users of dw_pcie_allocate_domains().

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 9 +++++++++
 drivers/pci/controller/dwc/pcie-designware.h      | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 3cc83d921376..df55c0ed75e4 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -211,6 +211,15 @@ static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
 	.free	= dw_pcie_irq_domain_free,
 };
 
+void dw_pcie_free_domains(struct dw_pcie_rp *pp)
+{
+	if (pp->irq_domain) {
+		irq_domain_remove(pp->irq_domain);
+		pp->irq_domain = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(dw_pcie_free_domains);
+
 int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index a44f2113925d..9f6f6f0ecd93 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -802,6 +802,7 @@ void dw_pcie_free_msi(struct dw_pcie_rp *pp);
 int dw_pcie_setup_rc(struct dw_pcie_rp *pp);
 int dw_pcie_host_init(struct dw_pcie_rp *pp);
 void dw_pcie_host_deinit(struct dw_pcie_rp *pp);
+void dw_pcie_free_domains(struct dw_pcie_rp *pp);
 int dw_pcie_allocate_domains(struct dw_pcie_rp *pp);
 void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn,
 				       int where);
@@ -846,6 +847,10 @@ static inline void dw_pcie_host_deinit(struct dw_pcie_rp *pp)
 {
 }
 
+static inline void dw_pcie_free_domains(struct dw_pcie_rp *pp)
+{
+}
+
 static inline int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
 {
 	return 0;
-- 
2.43.0