Am Sonntag, den 12.08.2012, 14:22 -0700 schrieb Bernie Thompson:

On Sun, Aug 12, 2012 at 3:34 AM, Thomas Meyer [off-list ref] wrote:
        guilty driver is probably udl_fb.c
        any ideas?


Hi Thomas,

Hi Bernie!

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.

Okay, I see. I'll switch to FB_UDL for now and remove DRM_UDL from my
config.

Is somebody working on porting commit
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h�21547d3c9c3bc653261f26d554cfabc4a083de to the DRM_UDL driver?

In Airlie's tree seems to be no commit related to this:

http://cgit.freedesktop.org/~airlied/linux/

with kind regards
thomas

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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