i back ported a fix from Alexander Holler:
The console functions are using spinlocks while calling fb-driver ops
but udlfb waits for a semaphore in many ops. This results in the BUG
"scheduling while atomic". One of those call flows is e.g.
vt_console_print() (spinlock printing_lock)
(...)
dlfb_ops_imageblit()
dlfb_handle_damage()
dlfb_get_urb()
down_timeout(semaphore)
BUG: scheduling while atomic
(...)
vt_console_print() (release spinlock printing_lock)
Fix this through a workqueue for dlfb_handle_damage().
Cc: <stable <at> vger.kernel.org>
Signed-off-by: Alexander Holler <holler <at> ahsoftware.de>
And it cured the hang.
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https://bugs.launchpad.net/bugs/1279403
Title:
udlfd video driver hangs in iscsi booted initrd : (trusty)
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