linux-kernel - [RFC 3/3] PCI: tegra: Support driver unbinding

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Date:	Tue, 13 Aug 2013 13:12:26 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Russell King <linux@....linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thierry Reding <treding@...dia.com>
Subject: [RFC 3/3] PCI: tegra: Support driver unbinding

Implement the platform driver's .remove() callback to free all resources
allocated during driver setup and call pci_common_exit() to cleanup ARM
specific datastructures. Unmap the fixed PCI I/O mapping by calling the
new pci_iounmap_io() function in the new .teardown() callback.

Finally, no longer set the .suppress_bind_attrs field to true to allow
the driver to unbind from a device.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/pci/host/pci-tegra.c | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 7356741..396f352 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -250,6 +250,7 @@ struct tegra_pcie {
 	int irq;
 
 	struct list_head busses;
+	struct list_head sys;
 	struct resource *cs;
 
 	struct resource io;
@@ -666,6 +667,11 @@ static struct pci_bus *tegra_pcie_scan_bus(int nr, struct pci_sys_data *sys)
 	return bus;
 }
 
+static void tegra_pcie_teardown(int nr, struct pci_sys_data *sys)
+{
+	pci_iounmap_io(nr * SZ_64K);
+}
+
 static irqreturn_t tegra_pcie_isr(int irq, void *arg)
 {
 	const char *err_msg[] = {
@@ -1583,7 +1589,9 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie)
 	hw.map_irq = tegra_pcie_map_irq;
 	hw.add_bus = tegra_pcie_add_bus;
 	hw.scan = tegra_pcie_scan_bus;
+	hw.teardown = tegra_pcie_teardown;
 	hw.ops = &tegra_pcie_ops;
+	hw.sys = &pcie->sys;
 
 	pci_common_init_dev(pcie->dev, &hw);
 
@@ -1637,6 +1645,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 
 	INIT_LIST_HEAD(&pcie->busses);
 	INIT_LIST_HEAD(&pcie->ports);
+	INIT_LIST_HEAD(&pcie->sys);
 	pcie->soc_data = match->data;
 	pcie->dev = &pdev->dev;
 
@@ -1686,14 +1695,40 @@ put_resources:
 	return err;
 }
 
+static int tegra_pcie_remove(struct platform_device *pdev)
+{
+	struct tegra_pcie *pcie = platform_get_drvdata(pdev);
+	struct tegra_pcie_bus *bus, *tmp;
+	int err;
+
+	pci_common_exit(&pcie->sys);
+
+	list_for_each_entry_safe(bus, tmp, &pcie->busses, list) {
+		vunmap(bus->area->addr);
+		kfree(bus);
+	}
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		err = tegra_pcie_disable_msi(pcie);
+		if (err < 0)
+			return err;
+	}
+
+	err = tegra_pcie_put_resources(pcie);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
 static struct platform_driver tegra_pcie_driver = {
 	.driver = {
 		.name = "tegra-pcie",
 		.owner = THIS_MODULE,
 		.of_match_table = tegra_pcie_of_match,
-		.suppress_bind_attrs = true,
 	},
 	.probe = tegra_pcie_probe,
+	.remove = tegra_pcie_remove,
 };
 module_platform_driver(tegra_pcie_driver);
 
-- 
1.8.3.4

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