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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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

--
To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Development]     [Kernel Announce]     [Kernel Newbies]     [Linux Networking Development]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Device Mapper]

  Powered by Linux