linux-kernel - RE: [PATCH 2/3] bus: fsl-mc: add root dprc rescan attribute

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Date:   Tue, 13 Mar 2018 09:59:23 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Laurentiu Tudor <laurentiu.tudor@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Ruxandra Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        "arnd@...db.de" <arnd@...db.de>
Subject: RE: [PATCH 2/3] bus: fsl-mc: add root dprc rescan attribute


> > Introduce the rescan attribute as a device attribute to synchronize
> > the fsl-mc bus objects and the MC firmware.
> >
> > To rescan the root dprc only, e.g.
> > echo 1 > /sys/bus/fsl-mc/devices/dprc.1/rescan
> >
> > Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> > ---
> >  drivers/bus/fsl-mc/dprc-driver.c    |  4 ++--
> >  drivers/bus/fsl-mc/fsl-mc-bus.c     | 28 ++++++++++++++++++++++++++++
> >  drivers/bus/fsl-mc/fsl-mc-private.h |  3 +++
> >  3 files changed, 33 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/bus/fsl-mc/dprc-driver.c
> > b/drivers/bus/fsl-mc/dprc-driver.c
> > index 52c7e15..be80e3a 100644
> > --- a/drivers/bus/fsl-mc/dprc-driver.c
> > +++ b/drivers/bus/fsl-mc/dprc-driver.c
> > @@ -214,8 +214,8 @@ static void dprc_add_new_devices(struct
> fsl_mc_device *mc_bus_dev,
> >   * populated before they can get allocation requests from probe callbacks
> >   * of the device drivers for the non-allocatable devices.
> >   */
> > -static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
> > -			     unsigned int *total_irq_count)
> > +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
> > +		      unsigned int *total_irq_count)
> >  {
> >  	int num_child_objects;
> >  	int dprc_get_obj_failures;
> > diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c
> > b/drivers/bus/fsl-mc/fsl-mc-bus.c index 240b99d..763cbeb 100644
> > --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> > +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> > @@ -137,8 +137,36 @@ static ssize_t modalias_show(struct device *dev,
> > struct device_attribute *attr,  }  static DEVICE_ATTR_RO(modalias);
> >
> > +static ssize_t rescan_store(struct device *dev,
> > +			    struct device_attribute *attr,
> > +			    const char *buf, size_t count) {
> > +	struct fsl_mc_device *root_mc_dev;
> > +	struct fsl_mc_bus *root_mc_bus;
> > +	unsigned long val;
> > +
> > +	if (!fsl_mc_is_root_dprc(dev))
> > +		return -EINVAL;
> > +
> > +	root_mc_dev = to_fsl_mc_device(dev);
> > +	root_mc_bus = to_fsl_mc_bus(root_mc_dev);
> > +
> > +	if (kstrtoul(buf, 0, &val) < 0)
> > +		return -EINVAL;
> > +
> > +	if (val) {
> > +		mutex_lock(&root_mc_bus->scan_mutex);
> > +		dprc_scan_objects(root_mc_dev, NULL);
> > +		mutex_unlock(&root_mc_bus->scan_mutex);
> > +	}
> > +
> > +	return count;
> > +}
> > +static DEVICE_ATTR_WO(rescan);
> 
> You did not add the correct new documentation in Documentation/ABI/ for
> the new sysfs attributes you are creating.  Please do so as part of this patch
> series.

Sorry for that. Will add the proper Documentation in the next version.

Ioana

> 
> thanks,
> 
> greg k-h