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SubjectRe: [PATCH v4 05/11] PCI: Use driver_set_override() instead of open-coding
On Sat, Mar 12, 2022 at 4:09 PM Krzysztof Kozlowski
<krzysztof.kozlowski@canonical.com> wrote:
>
> Use a helper to set driver_override to reduce amount of duplicated code.

the amount

> Make the driver_override field const char, because it is not modified by
> the core and it matches other subsystems.


Seems like mine #4 here
https://gist.github.com/andy-shev/a2cb1ee4767d6d2f5d20db53ecb9aabc :-)
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Thanks!

> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> ---
> drivers/pci/pci-sysfs.c | 28 ++++------------------------
> include/linux/pci.h | 6 +++++-
> 2 files changed, 9 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 602f0fb0b007..5c42965c32c2 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -567,31 +567,11 @@ 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;
> -
> - /* We need to keep extra room for a newline */
> - if (count >= (PAGE_SIZE - 1))
> - return -EINVAL;
> -
> - 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);
> + int ret;
>
> - kfree(old);
> + ret = driver_set_override(dev, &pdev->driver_override, buf, count);
> + if (ret)
> + return ret;
>
> return count;
> }
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 60d423d8f0c4..415491fb85f4 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -516,7 +516,11 @@ struct pci_dev {
> u16 acs_cap; /* ACS Capability offset */
> phys_addr_t rom; /* Physical address if not from BAR */
> size_t romlen; /* Length if not from BAR */
> - char *driver_override; /* Driver name to force a match */
> + /*
> + * Driver name to force a match. Do not set directly, because core
> + * frees it. Use driver_set_override() to set or clear it.
> + */
> + const char *driver_override;
>
> unsigned long priv_flags; /* Private flags for the PCI driver */
>
> --
> 2.32.0
>


--
With Best Regards,
Andy Shevchenko

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