From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivaylo Dimitrov Subject: Re: USB gadgets with configfs hang reboot Date: Mon, 18 Apr 2016 10:02:57 +0300 Message-ID: <571486A1.2060006@gmail.com> References: <20160115224839.GA19432@atomide.com> <569A1E32.1020502@gmail.com> <57081105.2050206@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <57081105.2050206-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Tony Lindgren , Felipe Balbi Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Greg Kroah-Hartman , Robert Baldyga , Andrzej Pietrasiewicz , Alan Stern , Michal Nazarewicz , =?UTF-8?Q?Pali_Roh=c3=a1r?= , Sebastian Reichel , Pavel Machek List-Id: linux-omap@vger.kernel.org On 8.04.2016 23:13, Ivaylo Dimitrov wrote: > Hi, > > On 16.01.2016 12:40, Ivaylo Dimitrov wrote: >> Hi, >> >> On 16.01.2016 00:48, Tony Lindgren wrote: >>> Hi all, >>> >>> Looks like there's some issue with the USB gadgets and configfs. >>> ... > > (copied from "Re: [PATCH] usb: f_mass_storage: test whether thread is > running before starting another" thread) > > Yet another problem with USB gadget, this time with f_acm - if there is > an open /dev/ttyGSn device, it is impossible to reboot/power down the > device. > > My investigation shown that there is a process(pnatd) that opens > /dev/ttyGSn devices, so gserial_free_port() hangs on > wait_event(port->close_wait, gs_closed(port)); if I do "cd > /sys/bus/platform/drivers/musb-hdrc && echo musb-hdrc.0.auto > unbind". > > Unfortunately I don't have serial debug port connector on my N900, so I > can't capture logs after the reboot command, however, I suspect it hangs > on the same place as with unbind. > > That looks weird, as one would expect that close() is called when the > kernel kills user processes on reboot/powerdown. > > Ivo Anyone? -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html