Re: The failure summary report of GEN3 for linux stable v4.7

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Niklas,

On Tuesday 09 Aug 2016 09:03:14 Niklas S�derlund wrote:
> On 2016-08-09 06:01:48 +0000, Kuninori Morimoto wrote:
> > Hi duclm
> > 
> > > root@linaro-nano:~# cd /sys/bus/platform/drivers/i2c-rcar; find -type l
> > > ./e6510000.i2c
> > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# echo e6510000.i2c >
> > > unbind [   30.505950] clk_unregister: unregistering prepared clock:
> > > clk_multiplier root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# ls
> > > -d e6510000.i2c ls: cannot access e6510000.i2c: No such file or
> > > directory
> > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# echo e6510000.i2c >
> > > bind [   40.825298] cs2000-cp 2-004f: revision - C1
> > > [   40.829587] i2c-rcar e6510000.i2c: probed
> > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# ls -d e6510000.i2c
> > > e6510000.i2c
> > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar#
> > > root@linaro-nano:/sys/bus/platform/drivers/i2c-rcar# aplay
> > > /home/board-lager/FSI/data/test.wav> 
> > Thank you for your report.
> > This is open (and deep) issue (Oops after "unbind" -> "rebind")
> > We have similar issue on I2C / ALSA SoC / DMAEngine / V4L2 SoC etc...
> > and we should care about it, but it is still under discussion I think.
> > ALSA SoC had started to solve this issue, but it will take over 2 years
> 
> FWIW the VIN patches for Gen3 which are posted to ML solves the
> unbind/bind problem for the rcar-vin driver.

Given that the driver

- allocates struct rvin_dev structure with devm_kzalloc
- embeds struct video_device in rvin_dev
- sets video_device::release to video_device_release_empty

I have some doubts about this :-)

Could you try the following sequence ?

- Open the video device node and keep it open (yavta --sleep-forever)
- Unbind the VIN device from the driver
- Close the video device node

-- 
Regards,

Laurent Pinchart