[RFC] Question about freeing of resource in 'atlas7_pinmux_probe()', in file 'drivers/pinctrl/sirf/pinctrl-atlas7.c'

[Marion & Christophe JAILLET]

Hi,

while playing with coccinelle, a missing 'of_node_put()' triggered in 
'atlas7_pinmux_probe()', in file 'drivers/pinctrl/sirf/pinctrl-atlas7.c'.

    /* The sd3 and sd9 shared all pins, and the function select by
     * SYS2PCI_SDIO9SEL register
     */
    sys2pci_np = of_find_node_by_name(NULL, "sys2pci");
    if (!sys2pci_np)
        return -EINVAL;
    ret = of_address_to_resource(sys2pci_np, 0, &res);
    if (ret) <-------------    missing of_node_put(sys2pci_np);
        return ret;
    pmx->sys2pci_base = devm_ioremap_resource(&pdev->dev, &res);
    if (IS_ERR(pmx->sys2pci_base)) {
        of_node_put(sys2pci_np); <-------------    added by commit 
151b8c5ba1eb
        return -ENOMEM;
    }

Looking at the history of this file, I found a recent commit that added 
another missing of_node_put (see above).


Adding missing 'of_node_put()' in error handling paths is fine, but in 
this particular case, I was wondering if one was not also missing in the 
normal path?


In such a case, I would revert 151b8c5ba1eb and propose something like:
    /* The sd3 and sd9 shared all pins, and the function select by
     * SYS2PCI_SDIO9SEL register
     */
    sys2pci_np = of_find_node_by_name(NULL, "sys2pci");
    if (!sys2pci_np)
        return -EINVAL;
    ret = of_address_to_resource(sys2pci_np, 0, &res);
    if (ret) {
        of_node_put(sys2pci_np);
        return ret;
    }
    of_node_put(sys2pci_np);

    pmx->sys2pci_base = devm_ioremap_resource(&pdev->dev, &res);
    if (IS_ERR(pmx->sys2pci_base))
        return -ENOMEM;

Thanks for your comment,

best regards,

CJ