From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from hqemgate15.nvidia.com ([216.228.121.64]:17401 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752303AbdLHI65 (ORCPT ); Fri, 8 Dec 2017 03:58:57 -0500 From: Manikanta Maddireddy To: , , , CC: , , , , , , , , , , , Manikanta Maddireddy Subject: [PATCH V4 4/7] PCI: tegra: Free resources on probe failure Date: Fri, 8 Dec 2017 14:28:10 +0530 Message-ID: <1512723493-865-5-git-send-email-mmaddireddy@nvidia.com> In-Reply-To: <1512723493-865-1-git-send-email-mmaddireddy@nvidia.com> References: <1512723493-865-1-git-send-email-mmaddireddy@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-pci-owner@vger.kernel.org List-ID: 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 --- 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 drivers/pci/host/pci-tegra.c | 100 ++++++++++++++++++++++++++++++++++++------- 1 file changed, 84 insertions(+), 16 deletions(-) diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 0d91f1a3a6b4..596dbe06d911 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -662,14 +662,25 @@ 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; @@ -1069,29 +1080,40 @@ 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? */ - if (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); } +} + +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->afi_rst); reset_control_assert(pcie->pex_rst); - if (!dev->pm_domain) - tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); + 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); err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies); if (err < 0) dev_warn(dev, "failed to disable regulators: %d\n", err); + + if (!dev->pm_domain) + tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); } static int tegra_pcie_power_on(struct tegra_pcie *pcie) @@ -1222,6 +1244,15 @@ static int tegra_pcie_phys_get_legacy(struct tegra_pcie *pcie) return 0; } +static void tegra_pcie_phys_put_legacy(struct tegra_pcie *pcie) +{ + int err; + + err = phy_exit(pcie->phy); + if (err < 0) + dev_err(pcie->dev, "failed to teardown PHY: %d\n", err); +} + static struct phy *devm_of_phy_optional_get_index(struct device *dev, struct device_node *np, const char *consumer, @@ -1275,6 +1306,19 @@ static int tegra_pcie_port_get_phys(struct tegra_pcie_port *port) return 0; } +static void tegra_pcie_port_put_phys(struct tegra_pcie_port *port) +{ + struct device *dev = port->pcie->dev; + unsigned int i; + int err; + + 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_phys_get(struct tegra_pcie *pcie) { const struct tegra_pcie_soc *soc = pcie->soc; @@ -1294,6 +1338,17 @@ 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; + + if (pcie->legacy_phy) + tegra_pcie_phys_put_legacy(pcie); + + list_for_each_entry(port, &pcie->ports, list) + tegra_pcie_port_put_phys(port); +} + static int tegra_pcie_get_resources(struct tegra_pcie *pcie) { struct device *dev = pcie->dev; @@ -1326,7 +1381,7 @@ 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"); @@ -1384,25 +1439,23 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) poweroff: tegra_pcie_power_off(pcie); +phys_put: + if (soc->program_uphy) + tegra_pcie_phys_put(pcie); return err; } 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; } @@ -2283,6 +2336,16 @@ 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; + + reset_control_assert(pcie->pcie_xrst); + + list_for_each_entry_safe(port, tmp, &pcie->ports, list) + tegra_pcie_port_disable(port); +} + static void tegra_pcie_change_link_speed(struct tegra_pcie *pcie, struct pci_dev *pci_dev) { @@ -2589,7 +2652,7 @@ 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); @@ -2598,7 +2661,7 @@ 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; } } @@ -2638,6 +2701,11 @@ static int tegra_pcie_probe(struct platform_device *pdev) disable_msi: if (IS_ENABLED(CONFIG_PCI_MSI)) tegra_pcie_disable_msi(pcie); + tegra_pcie_disable_ports(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