[PATCH v3 05/11] PCI: Use driver_set_override() instead of open-coding

Krzysztof Kozlowski
2022-02-27T13:53:16Z

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(-)

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 */

--
2.32.0