Re: [REGRESSION] commit 66c1ca0: {fbmem: fix fb_info->lock andmm->mmap_sem ...} causes Xfbdev not working

[Andrew Morton]

On Sat, 11 Apr 2009 17:04:00 +0200 Andrea Righi <righi.andrea@xxxxxxxxx> wrote:

> fbdev: fix info->lock deadlock in fbcon_event_notify()
> 
> fb_notifier_call_chain() is called with info->lock held, i.e. in
> do_fb_ioctl() => FBIOPUT_VSCREENINFO => fb_set_var() and the some
> notifier callbacks, like fbcon_event_notify(), try to re-acquire
> info->lock again.
> 
> Remove the lock/unlock_fb_info() in all the framebuffer notifier
> callbacks' and be sure to always call fb_notifier_call_chain() with
> info->lock held.

Thanks.  So do you think we should proceed with this patch instead of
reverting 66c1ca0?
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