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SubjectRe: [PATCH 4/5] staging: fsl-mc: bus rescan attribute to sync kernel with MC
On Sun, Oct 25, 2015 at 05:41:22PM -0500, Lijun Pan wrote:
> Introduce the rescan attribute as a bus attribute to
> synchronize the fsl-mc bus objects and the MC firmware.
>
> To rescan the fsl-mc bus, e.g.,
> echo 1 > /sys/bus/fsl-mc/rescan
>
> Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
> ---
> drivers/staging/fsl-mc/bus/mc-bus.c | 46 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
>
> diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
> index 33a56ad..f1baad7 100644
> --- a/drivers/staging/fsl-mc/bus/mc-bus.c
> +++ b/drivers/staging/fsl-mc/bus/mc-bus.c
> @@ -144,11 +144,57 @@ static const struct attribute_group *fsl_mc_dev_groups[] = {
> NULL,
> };
>
> +static int scan_fsl_mc_bus(struct device *dev, void *data)
> +{
> + struct fsl_mc_device *root_mc_dev;
> + struct fsl_mc_bus *root_mc_bus;
> +
> + if (is_root_dprc(dev)) {
> + root_mc_dev = to_fsl_mc_device(dev);
> + root_mc_bus = to_fsl_mc_bus(root_mc_dev);
> + mutex_lock(&root_mc_bus->scan_mutex);
> + dprc_scan_objects(root_mc_dev);
> + mutex_unlock(&root_mc_bus->scan_mutex);
> + }
> +
> + return 0;
> +}
> +
> +static ssize_t bus_rescan_store(struct bus_type *bus,
> + const char *buf, size_t count)
> +{
> + unsigned long val;
> +
> + if (kstrtoul(buf, 0, &val) < 0)
> + return -EINVAL;
> +
> + if (val)
> + bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
> +
> + return count;
> +}
> +static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
> +
> +static struct attribute *fsl_mc_bus_attrs[] = {
> + &bus_attr_rescan.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group fsl_mc_bus_group = {
> + .attrs = fsl_mc_bus_attrs,
> +};
> +
> +static const struct attribute_group *fsl_mc_bus_groups[] = {
> + &fsl_mc_bus_group,
> + NULL,
> +};
> +
> struct bus_type fsl_mc_bus_type = {
> .name = "fsl-mc",
> .match = fsl_mc_bus_match,
> .uevent = fsl_mc_bus_uevent,
> .dev_groups = fsl_mc_dev_groups,
> + .bus_groups = fsl_mc_bus_groups,
> };
> EXPORT_SYMBOL_GPL(fsl_mc_bus_type);

No documentation update as well?



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