From 0584bff09629666eea97c7ac428e55b00df211f5 Mon Sep 17 00:00:00 2001 From: Aman Sharma Date: Thu, 12 Mar 2020 00:49:02 +0530 Subject: PCI: Check for platform_get_irq() failure consistently The platform_get_irq*() interfaces return either a negative error number or a valid IRQ. 0 is not a valid return value, so check for "< 0" to detect failure as recommended by the function documentation. On failure, return the error number from platform_get_irq*() instead of making up a new one. Link: https://lore.kernel.org/r/cover.1583952275.git.amanharitsh123@gmail.com [bhelgaas: commit log, squash into one patch] Signed-off-by: Aman Sharma Signed-off-by: Bjorn Helgaas Acked-by: Linus Walleij Cc: Richard Zhu Cc: Lucas Stach Cc: Thierry Reding Cc: Karthikeyan Mitran Cc: Hou Zhiqiang Cc: Thomas Petazzoni Cc: Ryder Lee Cc: Marc Gonzalez --- drivers/pci/controller/dwc/pci-imx6.c | 4 ++-- drivers/pci/controller/dwc/pcie-tegra194.c | 4 ++-- drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 4 ++-- drivers/pci/controller/pci-aardvark.c | 3 +++ drivers/pci/controller/pci-v3-semi.c | 4 ++-- drivers/pci/controller/pcie-mediatek.c | 3 +++ drivers/pci/controller/pcie-tango.c | 4 ++-- 7 files changed, 16 insertions(+), 10 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index acfbd34032a8..8f08ae53f53e 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -868,9 +868,9 @@ static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie, if (IS_ENABLED(CONFIG_PCI_MSI)) { pp->msi_irq = platform_get_irq_byname(pdev, "msi"); - if (pp->msi_irq <= 0) { + if (pp->msi_irq < 0) { dev_err(dev, "failed to get MSI irq\n"); - return -ENODEV; + return pp->msi_irq; } } diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index ae30a2fd3716..f1f945cc7bcb 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -2190,9 +2190,9 @@ static int tegra_pcie_dw_probe(struct platform_device *pdev) } pp->irq = platform_get_irq_byname(pdev, "intr"); - if (!pp->irq) { + if (pp->irq < 0) { dev_err(dev, "Failed to get \"intr\" interrupt\n"); - return -ENODEV; + return pp->irq; } pcie->bpmp = tegra_bpmp_get(dev); diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c index a94be264240f..5907baa9b1f2 100644 --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c @@ -522,9 +522,9 @@ static int mobiveil_pcie_integrated_interrupt_init(struct mobiveil_pcie *pcie) mobiveil_pcie_enable_msi(pcie); rp->irq = platform_get_irq(pdev, 0); - if (rp->irq <= 0) { + if (rp->irq < 0) { dev_err(dev, "failed to map IRQ: %d\n", rp->irq); - return -ENODEV; + return rp->irq; } /* initialize the IRQ domains */ diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 2a20b649f40c..40a4257f0df1 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -973,6 +973,9 @@ static int advk_pcie_probe(struct platform_device *pdev) return PTR_ERR(pcie->base); irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + ret = devm_request_irq(dev, irq, advk_pcie_irq_handler, IRQF_SHARED | IRQF_NO_THREAD, "advk-pcie", pcie); diff --git a/drivers/pci/controller/pci-v3-semi.c b/drivers/pci/controller/pci-v3-semi.c index bd05221f5a22..a5bf945d2eda 100644 --- a/drivers/pci/controller/pci-v3-semi.c +++ b/drivers/pci/controller/pci-v3-semi.c @@ -777,9 +777,9 @@ static int v3_pci_probe(struct platform_device *pdev) /* Get and request error IRQ resource */ irq = platform_get_irq(pdev, 0); - if (irq <= 0) { + if (irq < 0) { dev_err(dev, "unable to obtain PCIv3 error IRQ\n"); - return -ENODEV; + return irq; } ret = devm_request_irq(dev, irq, v3_irq, 0, "PCIv3 error", v3); diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index cb982891b22b..ebfa7d5a4e2d 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -651,6 +651,9 @@ static int mtk_pcie_setup_irq(struct mtk_pcie_port *port, } port->irq = platform_get_irq(pdev, port->slot); + if (port->irq < 0) + return port->irq; + irq_set_chained_handler_and_data(port->irq, mtk_pcie_intr_handler, port); diff --git a/drivers/pci/controller/pcie-tango.c b/drivers/pci/controller/pcie-tango.c index 21a208da3f59..18c2c4313eb5 100644 --- a/drivers/pci/controller/pcie-tango.c +++ b/drivers/pci/controller/pcie-tango.c @@ -273,9 +273,9 @@ static int tango_pcie_probe(struct platform_device *pdev) writel_relaxed(0, pcie->base + SMP8759_ENABLE + offset); virq = platform_get_irq(pdev, 1); - if (virq <= 0) { + if (virq < 0) { dev_err(dev, "Failed to map IRQ\n"); - return -ENXIO; + return virq; } irq_dom = irq_domain_create_linear(fwnode, MSI_MAX, &dom_ops, pcie); -- cgit v1.2.3 From 914a1951d88968371c7d43400c9d936382cd7d69 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Thu, 7 May 2020 14:05:44 -0500 Subject: PCI: Replace zero-length array with flexible-array The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these as a flexible array member [1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that dynamic memory allocations won't be affected by this change: Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero. [1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type [1]. There are some instances of code in which the sizeof() operator is being incorrectly/erroneously applied to zero-length arrays, and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Link: https://lore.kernel.org/r/20200507190544.GA15633@embeddedor Signed-off-by: Gustavo A. R. Silva Signed-off-by: Bjorn Helgaas --- drivers/pci/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/pci') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 595fcf59843f..bb78f580814e 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1578,7 +1578,7 @@ EXPORT_SYMBOL(pci_restore_state); struct pci_saved_state { u32 config_space[16]; - struct pci_cap_saved_data cap[0]; + struct pci_cap_saved_data cap[]; }; /** -- cgit v1.2.3 From 6ae72bfa656ea04806f98ef85cb44b0789064362 Mon Sep 17 00:00:00 2001 From: Yicong Yang Date: Sat, 9 May 2020 18:19:28 +0800 Subject: PCI: Unify pcie_find_root_port() and pci_find_pcie_root_port() Previously we used pcie_find_root_port() to find a Root Port from a PCIe device and pci_find_pcie_root_port() to find a Root Port from a Conventional PCI device. Unify the two functions and use pcie_find_root_port() to find a Root Port from either a Conventional PCI device or a PCIe device. Then there is no need to distinguish the type of the device. Link: https://lore.kernel.org/r/1589019568-5216-1-git-send-email-yangyicong@hisilicon.com Signed-off-by: Yicong Yang Signed-off-by: Bjorn Helgaas Acked-by: Kalle Valo # wireless Acked-by: Mika Westerberg # thunderbolt --- drivers/pci/pci-acpi.c | 2 +- drivers/pci/pci.c | 24 ------------------------ drivers/pci/probe.c | 2 +- drivers/pci/quirks.c | 2 +- 4 files changed, 3 insertions(+), 27 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index d21969fba6ab..d820a55ae71c 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -948,7 +948,7 @@ static bool acpi_pci_bridge_d3(struct pci_dev *dev) * Look for a special _DSD property for the root port and if it * is set we know the hierarchy behind it supports D3 just fine. */ - root = pci_find_pcie_root_port(dev); + root = pcie_find_root_port(dev); if (!root) return false; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index bb78f580814e..227a3a979ec4 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -751,30 +751,6 @@ struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res) } EXPORT_SYMBOL(pci_find_resource); -/** - * pci_find_pcie_root_port - return PCIe Root Port - * @dev: PCI device to query - * - * Traverse up the parent chain and return the PCIe Root Port PCI Device - * for a given PCI Device. - */ -struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) -{ - struct pci_dev *bridge, *highest_pcie_bridge = dev; - - bridge = pci_upstream_bridge(dev); - while (bridge && pci_is_pcie(bridge)) { - highest_pcie_bridge = bridge; - bridge = pci_upstream_bridge(bridge); - } - - if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) - return NULL; - - return highest_pcie_bridge; -} -EXPORT_SYMBOL(pci_find_pcie_root_port); - /** * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos * @dev: the PCI device to operate on diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 77b8a145c39b..cdff469ba070 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2056,7 +2056,7 @@ static void pci_configure_relaxed_ordering(struct pci_dev *dev) * For now, we only deal with Relaxed Ordering issues with Root * Ports. Peer-to-Peer DMA is another can of worms. */ - root = pci_find_pcie_root_port(dev); + root = pcie_find_root_port(dev); if (!root) return; diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 28c9a2409c50..885044d050a6 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4319,7 +4319,7 @@ DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_AMD, 0x1a02, PCI_CLASS_NOT_DEFINED, */ static void quirk_disable_root_port_attributes(struct pci_dev *pdev) { - struct pci_dev *root_port = pci_find_pcie_root_port(pdev); + struct pci_dev *root_port = pcie_find_root_port(pdev); if (!root_port) { pci_warn(pdev, "PCIe Completion erratum may cause device errors\n"); -- cgit v1.2.3 From 5dda3ba6fc9c5d784b48687a3f3003023a0d7c74 Mon Sep 17 00:00:00 2001 From: Jay Fang Date: Sat, 16 May 2020 15:00:14 +0800 Subject: PCI/PME: Fix kernel-doc of pcie_pme_resume() and pcie_pme_remove() Fix kernel-doc of the "srv" parameter to pcie_pme_resume() and pcie_pme_remove(). Building with W=1 produced these warnings: drivers/pci/pcie/pme.c:414: warning: Function parameter or member 'srv' not described in 'pcie_pme_resume' drivers/pci/pcie/pme.c:437: warning: Function parameter or member 'srv' not described in 'pcie_pme_remove' Link: https://lore.kernel.org/r/1589612414-61682-1-git-send-email-f.fangjian@huawei.com Signed-off-by: Jay Fang Signed-off-by: Bjorn Helgaas --- drivers/pci/pcie/pme.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c index f38e6c19dd50..6a32970bb731 100644 --- a/drivers/pci/pcie/pme.c +++ b/drivers/pci/pcie/pme.c @@ -408,7 +408,7 @@ static int pcie_pme_suspend(struct pcie_device *srv) /** * pcie_pme_resume - Resume PCIe PME service device. - * @srv - PCIe service device to resume. + * @srv: PCIe service device to resume. */ static int pcie_pme_resume(struct pcie_device *srv) { @@ -431,7 +431,7 @@ static int pcie_pme_resume(struct pcie_device *srv) /** * pcie_pme_remove - Prepare PCIe PME service device for removal. - * @srv - PCIe service device to remove. + * @srv: PCIe service device to remove. */ static void pcie_pme_remove(struct pcie_device *srv) { -- cgit v1.2.3 From 3910ebaca8eae0cb9d41a20efe1bcb375ec64dfb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= Date: Tue, 26 May 2020 21:39:05 +0000 Subject: PCI: Rename _DSM constants to align with spec MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Rename PCI-related _DSM constants to align them with the PCI Firmware Spec, r3.2, sec 4.6. No functional change intended. Link: https://lore.kernel.org/r/20200526213905.2479381-1-kw@linux.com Signed-off-by: Krzysztof Wilczyński Signed-off-by: Bjorn Helgaas --- drivers/pci/pci-acpi.c | 4 ++-- drivers/pci/pci-label.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index d820a55ae71c..7224b1e5f2a8 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -1128,7 +1128,7 @@ void acpi_pci_add_bus(struct pci_bus *bus) return; obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3, - RESET_DELAY_DSM, NULL); + DSM_PCI_POWER_ON_RESET_DELAY, NULL); if (!obj) return; @@ -1193,7 +1193,7 @@ static void pci_acpi_optimize_delay(struct pci_dev *pdev, pdev->d3cold_delay = 0; obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 3, - FUNCTION_DELAY_DSM, NULL); + DSM_PCI_DEVICE_READINESS_DURATIONS, NULL); if (!obj) return; diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c index a5910f942857..707dd9808676 100644 --- a/drivers/pci/pci-label.c +++ b/drivers/pci/pci-label.c @@ -178,7 +178,7 @@ static int dsm_get_label(struct device *dev, char *buf, return -1; obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 0x2, - DEVICE_LABEL_DSM, NULL); + DSM_PCI_DEVICE_NAME, NULL); if (!obj) return -1; @@ -218,7 +218,7 @@ static bool device_has_dsm(struct device *dev) return false; return !!acpi_check_dsm(handle, &pci_acpi_dsm_guid, 0x2, - 1 << DEVICE_LABEL_DSM); + 1 << DSM_PCI_DEVICE_NAME); } static umode_t acpi_index_string_exist(struct kobject *kobj, -- cgit v1.2.3