| Message ID | 20220312132856.65163-6-krzysztof.kozlowski@canonical.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Fix broken usage of driver_override (and kfree of static memory) | expand |
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 >
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 */