Re: [PATCH] PCI: xilinx: Modify error handling

From: Bjorn Helgaas
Date: Mon Jul 25 2016 - 13:42:37 EST


On Wed, Jun 29, 2016 at 08:48:20PM +0530, Amitoj Kaur Chawla wrote:
> Failure of of_get_next_child returns NULL, not an ERR_PTR. Use
> appropriate error code -ENODEV to be returned on failure instead.
>
> The Coccinelle semantic patch used to find this issue is as follows:
> @@
> expression E,E1;
> @@
>
> if (
> * E == NULL
> ) { <+... when != E = E1
> PTR_ERR(E)
> ...+> }
>
> Signed-off-by: Amitoj Kaur Chawla <amitoj1606@xxxxxxxxx>
> ---
> drivers/pci/host/pcie-xilinx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c
> index 65f0fe0..d76ea8d 100644
> --- a/drivers/pci/host/pcie-xilinx.c
> +++ b/drivers/pci/host/pcie-xilinx.c
> @@ -550,7 +550,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> pcie_intc_node = of_get_next_child(node, NULL);
> if (!pcie_intc_node) {
> dev_err(dev, "No PCIe Intc node found\n");
> - return PTR_ERR(pcie_intc_node);
> + return -ENODEV;

This fix is included in the patch posted by Christophe JAILLET
<christophe.jaillet@xxxxxxxxxx>, along with two other similar fixes.
I applied Christophe's patch to pci/host-xilinx for v4.8.

> }
>
> port->irq_domain = irq_domain_add_linear(pcie_intc_node, 4,
> --
> 1.9.1
>
> --
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