From: Malcolm Priestley <tvboxspy@gmail.com>
To: Antti Palosaari <crope@iki.fi>
Cc: linux-media@vger.kernel.org
Subject: Re: [PATCH 2/7] af9015 Remove call to get config from probe.
Date: Sun, 13 Nov 2011 12:04:11 +0000 [thread overview]
Message-ID: <4ebfb241.8366b40a.1a27.7902@mx.google.com> (raw)
In-Reply-To: <4EBECAA4.1050400@iki.fi>
On Sat, 2011-11-12 at 21:36 +0200, Antti Palosaari wrote:
> On 11/12/2011 08:22 PM, Malcolm Priestley wrote:
> > On Sat, 2011-11-12 at 18:18 +0200, Antti Palosaari wrote:
> >> On 11/12/2011 05:55 PM, Malcolm Priestley wrote:
> >>> Remove get config from probe and move to identify_state.
> >>>
> >>> intf->cur_altsetting->desc.bInterfaceNumber is always expected to be zero, so there
> >>> no point in checking for it.
> >>
> >> Are you sure? IIRC there is HID remote on interface 1 or 2 or so (some
> >> other than 0). Please double check.
> >>
> >>> Calling from probe seems to cause a race condition with some USB controllers.
> >>
> >> Why?
> >>
> > Is some other module going to claim the device?
> >
> > Would it not be better use usb_set_interface to set it back to 0?
> >
I spoke too soon, there is someone else about.
On boot input claims interface 1
Nov 13 11:43:36 tvbox kernel: [ 1.830276] input: Afatech DVB-T 2 as /devices/pci0000:00/0000:00:06.1/usb2/2-4/2-4:1.1/input/input2
Nov 13 11:43:36 tvbox kernel: [ 1.830367] generic-usb 0003:1B80:E399.0001: input,hidraw0: USB HID v1.01 Keyboard [Afatech DVB-T 2] on usb-0000:00:06.1-4/input1
...
Nov 13 11:43:38 tvbox kernel: [ 19.151700] dvb-usb: found a 'KWorld PlusTV Dual DVB-T Stick (DVB-T 399U)' in cold state, will try to load a firmware
...
Nov 13 11:43:39 tvbox kernel: [ 20.313483] input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:06.1/usb2/2-4/rc/rc0/input8
Nov 13 11:43:39 tvbox kernel: [ 20.313528] rc0: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:06.1/usb2/2-4/rc/rc0
Nov 13 11:43:39 tvbox kernel: [ 20.313530] dvb-usb: schedule remote query interval to 500 msecs.
Nov 13 11:43:39 tvbox kernel: [ 20.313534] dvb-usb: KWorld PlusTV Dual DVB-T Stick (DVB-T 399U) successfully initialized and connected.
So, a usb_set_interface is needed to make sure we on interface 0 and remain there.
Regards
Malcolm
next prev parent reply other threads:[~2011-11-13 12:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-12 15:55 [PATCH 2/7] af9015 Remove call to get config from probe Malcolm Priestley
2011-11-12 16:18 ` Antti Palosaari
2011-11-12 18:22 ` Malcolm Priestley
2011-11-12 19:36 ` Antti Palosaari
2011-11-13 12:04 ` Malcolm Priestley [this message]
2011-11-13 12:34 ` Antti Palosaari
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