On 27/08/18 20:44, Joe Jin wrote:
> Export device state to sysfs to allow for easier get device state.
>
> Signed-off-by: Joe Jin <joe....@oracle.com>
> Boris Ostrovsky <boris.ostrov...@oracle.com>
> Juergen Gross <jgr...@suse.com>
Please add the related documentation to
Documentation/ABI/stable/sysfs-bus-xen-backend
Juergen
> ---
> drivers/xen/xenbus/xenbus_probe.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/xen/xenbus/xenbus_probe.c
> b/drivers/xen/xenbus/xenbus_probe.c
> index 74888cacd0b0..52f99b80a1c0 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -402,10 +402,19 @@ static ssize_t modalias_show(struct device *dev,
> }
> static DEVICE_ATTR_RO(modalias);
>
> +static ssize_t state_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%s\n",
> + xenbus_strstate(to_xenbus_device(dev)->state));
> +}
> +static DEVICE_ATTR_RO(state);
> +
> static struct attribute *xenbus_dev_attrs[] = {
> &dev_attr_nodename.attr,
> &dev_attr_devtype.attr,
> &dev_attr_modalias.attr,
> + &dev_attr_state.attr,
> NULL,
> };
>
>
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