Michael Kelley (LINUX)
2022-Feb-27 15:53 UTC
[PATCH v3 04/11] hv: Use driver_set_override() instead of open-coding
From: Krzysztof Kozlowski <krzysztof.kozlowski at canonical.com> Sent: Sunday, February 27, 2022 5:52 AM> > 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 at canonical.com> > --- > drivers/hv/vmbus_drv.c | 28 ++++------------------------ > include/linux/hyperv.h | 7 ++++++- > 2 files changed, 10 insertions(+), 25 deletions(-) > > diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c > index 12a2b37e87f3..a0ff4139c3d2 100644 > --- a/drivers/hv/vmbus_drv.c > +++ b/drivers/hv/vmbus_drv.c > @@ -575,31 +575,11 @@ static ssize_t driver_override_store(struct device *dev, > const char *buf, size_t count) > { > struct hv_device *hv_dev = device_to_hv_device(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 = hv_dev->driver_override; > - if (strlen(driver_override)) { > - hv_dev->driver_override = driver_override; > - } else { > - kfree(driver_override); > - hv_dev->driver_override = NULL; > - } > - device_unlock(dev); > + int ret; > > - kfree(old); > + ret = driver_set_override(dev, &hv_dev->driver_override, buf, count); > + if (ret) > + return ret; > > return count; > } > diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h > index fe2e0179ed51..beea11874be2 100644 > --- a/include/linux/hyperv.h > +++ b/include/linux/hyperv.h > @@ -1257,7 +1257,12 @@ struct hv_device { > u16 device_id; > > struct device device; > - 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; > > struct vmbus_channel *channel; > struct kset *channels_kset; > -- > 2.32.0Reviewed-by: Michael Kelley <mikelley at microsoft.com>