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Date: Tue, 19 Apr 2016 20:06:27 -0500 From: Bjorn Helgaas <helgaas@...nel.org> To: Murali Karicheri <m-karicheri2@...com> Cc: bhelgaas@...gle.com, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH next v2 2/2] PCI: keystone: remove unnecessary goto statement Hi Murali, On Mon, Apr 11, 2016 at 10:50:31AM -0400, Murali Karicheri wrote: > Fix the misuse of goto statement in ks_pcie_get_irq_controller_info() > as simple return is more appropriate for this function. While at > it add an error log for absence of interrupt controller node. > > Signed-off-by: Murali Karicheri <m-karicheri2@...com> > Cc: Rob Herring <robh+dt@...nel.org> > Cc: Pawel Moll <pawel.moll@....com> > Cc: Mark Rutland <mark.rutland@....com> > Cc: Ian Campbell <ijc+devicetree@...lion.org.uk> > Cc: Kumar Gala <galak@...eaurora.org> > Cc: Bjorn Helgaas <bhelgaas@...gle.com> > > --- > v2 - removed an unnecessary extra line added in the previous version > v1 - same as before initial version > drivers/pci/host/pci-keystone.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c > index 299f2f0..0234828 100644 > --- a/drivers/pci/host/pci-keystone.c > +++ b/drivers/pci/host/pci-keystone.c > @@ -181,11 +181,13 @@ static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, > *np_temp = of_find_node_by_name(np_pcie, controller); > if (!(*np_temp)) { > dev_err(dev, "Node for %s is absent\n", controller); > - goto out; > + return ret; > } > temp = of_irq_count(*np_temp); > - if (!temp) > - goto out; > + if (!temp) { > + dev_err(dev, "No entries in %s\n", controller); > + return ret; > + } > if (temp > max_host_irqs) > dev_warn(dev, "Too many %s interrupts defined %u\n", > (legacy ? "legacy" : "MSI"), temp); > @@ -203,7 +205,6 @@ static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, > *num_irqs = temp; > ret = 0; > } > -out: > return ret; I really like these cleanups; thanks for doing them. I went a step further because I think we always know the value of "ret" at each of these places, so I inserted those and dropped "ret" altogether. I applied the patch below to pci/host-keystone for v4.7. commit a7ed67a22484f70b8d0c33c76ad7faeac97222a7 Author: Murali Karicheri <m-karicheri2@...com> Date: Mon Apr 11 10:50:31 2016 -0400 PCI: keystone: Remove unnecessary goto statement Fix the misuse of goto statement in ks_pcie_get_irq_controller_info() as simple return is more appropriate for this function. While at it add an error log for absence of interrupt controller node. [bhelgaas: drop "ret" altogether since we always know the return value] Signed-off-by: Murali Karicheri <m-karicheri2@...com> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com> CC: Rob Herring <robh+dt@...nel.org> CC: Pawel Moll <pawel.moll@....com> CC: Mark Rutland <mark.rutland@....com> CC: Ian Campbell <ijc+devicetree@...lion.org.uk> CC: Kumar Gala <galak@...eaurora.org> diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c index 6868918..95a66f77 100644 --- a/drivers/pci/host/pci-keystone.c +++ b/drivers/pci/host/pci-keystone.c @@ -160,7 +160,7 @@ static void ks_pcie_legacy_irq_handler(struct irq_desc *desc) static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, char *controller, int *num_irqs) { - int temp, max_host_irqs, legacy = 1, *host_irqs, ret = -EINVAL; + int temp, max_host_irqs, legacy = 1, *host_irqs; struct device *dev = ks_pcie->pp.dev; struct device_node *np_pcie = dev->of_node, **np_temp; @@ -181,11 +181,15 @@ static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, *np_temp = of_find_node_by_name(np_pcie, controller); if (!(*np_temp)) { dev_err(dev, "Node for %s is absent\n", controller); - goto out; + return -EINVAL; } + temp = of_irq_count(*np_temp); - if (!temp) - goto out; + if (!temp) { + dev_err(dev, "No IRQ entries in %s\n", controller); + return -EINVAL; + } + if (temp > max_host_irqs) dev_warn(dev, "Too many %s interrupts defined %u\n", (legacy ? "legacy" : "MSI"), temp); @@ -199,12 +203,13 @@ static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, if (!host_irqs[temp]) break; } + if (temp) { *num_irqs = temp; - ret = 0; + return 0; } -out: - return ret; + + return -EINVAL; } static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie) @@ -345,7 +350,7 @@ static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie, return ret; } - return ret; + return 0; } static const struct of_device_id ks_pcie_of_match[] = { @@ -374,7 +379,7 @@ static int __init ks_pcie_probe(struct platform_device *pdev) struct resource *res; void __iomem *reg_p; struct phy *phy; - int ret = 0; + int ret; ks_pcie = devm_kzalloc(&pdev->dev, sizeof(*ks_pcie), GFP_KERNEL);
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