[UDL] general protection fault in fb_deferred_io_mkwrite()

[Bernie Thompson]

On Sun, Aug 12, 2012 at 3:34 AM, Thomas Meyer <thomas at m3y3r.de> wrote:

> guilty driver is probably udl_fb.c
> any ideas?
>

Hi Thomas,

We were seeing similar issues in udlfb (the original fbdev version of this
driver), which were fixed earlier this year by getting all rendering
operations out of probe/disconnect -- those which might trigger fb_defio
page faults in an inappropriate context, or be long-running. Here's some
more detail:
http://plugable.com/2012/06/21/displaylink-usb-devices-on-linux-kernel-3-4-0/comment-page-1/#comment-5896


Unfortunately, I haven't had time to get going with udl myself, so haven't
been able to port and confirm.  Thanks for raising and staying on this.

Best wishes,
Bernie

[   45.633336] RIP  [<ffffffff8123becc>] fb_deferred_io_mkwrite+0xdc/0xf0
> [   45.633336]  RSP <ffff880126559c98>
> [   45.711547] ---[ end trace d4732d5a0bf375fb ]---
> [   45.720961] released /dev/fb1 user=1 count=0
>
>
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