| Message ID | 20220227135214.145599-6-krzysztof.kozlowski@canonical.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Fix broken usage of driver_override (and kfree of static memory) | expand |
On Sun, Feb 27, 2022 at 02:52:08PM +0100, Krzysztof Kozlowski wrote: > Use a helper for seting driver_override to reduce amount of duplicated > code. Make the driver_override field const char, because it is not > modified by the core and it matches other subsystems. s/seting/setting/ or even better, s/for seting/to set/ > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> > - 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. Wrap this comment to fill 78 columns or so. > + */ > + const char *driver_override; > > unsigned long priv_flags; /* Private flags for the PCI driver */ > > -- > 2.32.0 >
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 8253a5413d7c..5c00a8aebdf9 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -516,7 +516,12 @@ 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 */
Use a helper for seting driver_override to reduce amount of duplicated code. Make the driver_override field const char, because it is not modified by the core and it matches other subsystems. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> --- drivers/pci/pci-sysfs.c | 28 ++++------------------------ include/linux/pci.h | 7 ++++++- 2 files changed, 10 insertions(+), 25 deletions(-)