tegra_pcie_probe() can fail in multiple instances, this patch takes care of freeing the resources which are allocated before probe fail. Signed-off-by: Manikanta Maddireddy <mmaddireddy@xxxxxxxxxx> --- V2: * no change in this patch V3: * change 'if check' to 'legacy_phy is true' for tegra_pcie_phys_put_legacy() * commit log correction V4: * no change in this patch V5: * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and rebased on linux-next V6: * no change in this patch drivers/pci/host/pci-tegra.c | 99 +++++++++++++++++++++++++++++++++++--------- 1 file changed, 79 insertions(+), 20 deletions(-) diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index e4b47ebc91fe..e68507f658d8 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -562,14 +562,25 @@ static int tegra_pcie_request_resources(struct tegra_pcie *pcie) pci_add_resource(windows, &pcie->busn); err = devm_request_pci_bus_resources(dev, windows); - if (err < 0) + if (err < 0) { + pci_free_resource_list(windows); return err; + } pci_remap_iospace(&pcie->pio, pcie->io.start); return 0; } +static void tegra_pcie_free_resources(struct tegra_pcie *pcie) +{ + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); + struct list_head *windows = &host->windows; + + pci_unmap_iospace(&pcie->pio); + pci_free_resource_list(windows); +} + static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin) { struct tegra_pcie *pcie = pdev->bus->sysdata; @@ -979,24 +990,35 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) return 0; } -static void tegra_pcie_power_off(struct tegra_pcie *pcie) +static void tegra_pcie_disable_controller(struct tegra_pcie *pcie) { - struct device *dev = pcie->dev; - const struct tegra_pcie_soc *soc = pcie->soc; int err; - /* TODO: disable and unprepare clocks? */ + reset_control_assert(pcie->pcie_xrst); - if (soc->program_uphy) { + if (pcie->soc->program_uphy) { err = tegra_pcie_phy_power_off(pcie); if (err < 0) - dev_err(dev, "failed to power off PHY(s): %d\n", err); + dev_err(pcie->dev, "failed to power off PHY(s): %d\n", + err); } +} + +static void tegra_pcie_power_off(struct tegra_pcie *pcie) +{ + struct device *dev = pcie->dev; + const struct tegra_pcie_soc *soc = pcie->soc; + int err; - reset_control_assert(pcie->pcie_xrst); reset_control_assert(pcie->afi_rst); reset_control_assert(pcie->pex_rst); + clk_disable_unprepare(pcie->pll_e); + if (soc->has_cml_clk) + clk_disable_unprepare(pcie->cml_clk); + clk_disable_unprepare(pcie->afi_clk); + clk_disable_unprepare(pcie->pex_clk); + if (!dev->pm_domain) tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); @@ -1205,6 +1227,30 @@ static int tegra_pcie_phys_get(struct tegra_pcie *pcie) return 0; } +static void tegra_pcie_phys_put(struct tegra_pcie *pcie) +{ + struct tegra_pcie_port *port; + struct device *dev = pcie->dev; + int err, i; + + if (pcie->legacy_phy) { + err = phy_exit(pcie->phy); + if (err < 0) + dev_err(dev, "failed to teardown PHY: %d\n", err); + return; + } + + list_for_each_entry(port, &pcie->ports, list) { + for (i = 0; i < port->lanes; i++) { + err = phy_exit(port->phys[i]); + if (err < 0) + dev_err(dev, "failed to teardown PHY#%u: %d\n", + i, err); + } + } +} + + static int tegra_pcie_get_resources(struct tegra_pcie *pcie) { struct device *dev = pcie->dev; @@ -1236,7 +1282,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) err = tegra_pcie_power_on(pcie); if (err) { dev_err(dev, "failed to power up: %d\n", err); - return err; + goto phys_put; } pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads"); @@ -1288,6 +1334,9 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) return 0; +phys_put: + if (soc->program_uphy) + tegra_pcie_phys_put(pcie); poweroff: tegra_pcie_power_off(pcie); return err; @@ -1295,20 +1344,15 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) static int tegra_pcie_put_resources(struct tegra_pcie *pcie) { - struct device *dev = pcie->dev; const struct tegra_pcie_soc *soc = pcie->soc; - int err; if (pcie->irq > 0) free_irq(pcie->irq, pcie); tegra_pcie_power_off(pcie); - if (soc->program_uphy) { - err = phy_exit(pcie->phy); - if (err < 0) - dev_err(dev, "failed to teardown PHY: %d\n", err); - } + if (soc->program_uphy) + tegra_pcie_phys_put(pcie); return 0; } @@ -2048,6 +2092,16 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) } } +static void tegra_pcie_disable_ports(struct tegra_pcie *pcie) +{ + struct tegra_pcie_port *port, *tmp; + + list_for_each_entry_safe(port, tmp, &pcie->ports, list) { + tegra_pcie_port_disable(port); + tegra_pcie_port_free(port); + } +} + static const struct tegra_pcie_soc tegra20_pcie = { .num_ports = 2, .msi_base_shift = 0, @@ -2278,7 +2332,7 @@ static int tegra_pcie_probe(struct platform_device *pdev) err = tegra_pcie_request_resources(pcie); if (err) - goto put_resources; + goto disable_controller; /* setup the AFI address translations */ tegra_pcie_setup_translations(pcie); @@ -2287,7 +2341,7 @@ static int tegra_pcie_probe(struct platform_device *pdev) err = tegra_pcie_enable_msi(pcie); if (err < 0) { dev_err(dev, "failed to enable MSI support: %d\n", err); - goto put_resources; + goto free_resources; } } @@ -2302,7 +2356,7 @@ static int tegra_pcie_probe(struct platform_device *pdev) err = pci_scan_root_bus_bridge(host); if (err < 0) { dev_err(dev, "failed to register host: %d\n", err); - goto disable_msi; + goto disable_ports; } pci_bus_size_bridges(host->bus); @@ -2321,9 +2375,14 @@ static int tegra_pcie_probe(struct platform_device *pdev) return 0; -disable_msi: +disable_ports: + tegra_pcie_disable_ports(pcie); if (IS_ENABLED(CONFIG_PCI_MSI)) tegra_pcie_disable_msi(pcie); +free_resources: + tegra_pcie_free_resources(pcie); +disable_controller: + tegra_pcie_disable_controller(pcie); put_resources: tegra_pcie_put_resources(pcie); return err; -- 2.1.4
