Re: Fwd: [Bug 827538] DVB USB device firmware requested in module_init()

[Antti Palosaari <crope@iki.fi>]

On 06/01/2012 10:52 PM, Antti Palosaari wrote:
>
>
> -------- Original Message --------
> Subject: [Bug 827538] DVB USB device firmware requested in module_init()
> Date: Fri, 01 Jun 2012 19:44:17 +0000
> From: bugzilla@redhat.com
> To: crope@iki.fi
>
> https://bugzilla.redhat.com/show_bug.cgi?id=827538
>
> Kay Sievers <kay@redhat.com> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
>
> CC| |gansalmon@Gmail.com,
> | |itamar@ispbrasil.com.br,
> | |kernel-maint@redhat.com,
> | |madhu.chinakonda@gmail.com
> Component|udev |kernel
> Assignee|udev-maint@redhat.com |kernel-maint@redhat.com
> Summary|DVB USB device firmware |DVB USB device firmware
> |downloading takes 30 |requested in module_init()
> |seconds |
>
> --- Comment #1 from Kay Sievers <kay@redhat.com> ---
> This is very likely a kernel driver issue.
>
> Drivers must not load firmware in the module_init() path, or device
> probe()/bind() path. This creates a deadlock in the event handling.
>
> We used to silently try to work around that, but recently started
> to log this error explicitely.
>
> The firmware should in general be requested asynchronously, or at the first
> open() of the device.
>
> Details are here:
> http://thread.gmane.org/gmane.linux.network/217729
>

I suspect all of our DVB USB firmere downloading problems are coming 
from that issues. I mean especially those suspend / resume failings too.

What I think I will try to delay driver registertration using workqueue. 
Return just success for the USB driver probe and continue real probe 
from workqueue.

Antti
-- 
http://palosaari.fi/