Re: [PATCH v2 05/11] pci: use helper for safer setting of driver_override

Bjorn Helgaas
2022-02-23T21:51:23Z

In subject, to match drivers/pci/ convention, do something like:

PCI: Use driver_set_override() instead of open-coding

On Wed, Feb 23, 2022 at 08:13:04PM +0100, Krzysztof Kozlowski wrote:
> Use a helper for seting driver_override to reduce amount of duplicated
> code.

s/seting/setting/

> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---
> drivers/pci/pci-sysfs.c | 24 ++++--------------------
> 1 file changed, 4 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 602f0fb0b007..16a163d4623e 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -567,31 +567,15 @@ static ssize_t driver_override_store(struct device *dev,
> const char *buf, size_t count)
> {
> struct pci_dev *pdev = to_pci_dev(dev);
> - char *driver_override, *old, *cp;
> + int ret;
>
> /* We need to keep extra room for a newline */
> if (count >= (PAGE_SIZE - 1))
> return -EINVAL;

This check makes no sense in the new function. Michael alluded to
this as well.

> - driver_override = kstrndup(buf, count, GFP_KERNEL);
> - if (!driver_override)
> - return -ENOMEM;
> -
> - cp = strchr(driver_override, '\n');
> - if (cp)
> - *cp = '\0';
> -
> - device_lock(dev);
> - old = pdev->driver_override;
> - if (strlen(driver_override)) {
> - pdev->driver_override = driver_override;
> - } else {
> - kfree(driver_override);
> - pdev->driver_override = NULL;
> - }
> - device_unlock(dev);
> -
> - kfree(old);
> + ret = driver_set_override(dev, &pdev->driver_override, buf);
> + if (ret)
> + return ret;
>
> return count;
> }
> --
> 2.32.0
>
>
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