[PATCH 0/2] console_lock debug improvements
Daniel Vetter
daniel.vetter at ffwll.ch
Tue Aug 21 15:34:30 PDT 2012
Hi all,
After Dave Airlie blew through a few days to track down a deadlock at boot-up
when handing over from the firmware fb to the kms/drm framebuffer driver (1), I've
figured that lockdep /should/ have caught this.
And indeed, by adding proper annotations to the console_lock it complains about
the potential deadlock when exercising the entire driver life-cycle of just one
fb driver (i.e. not even a handover required). While at it, I've replaced the
existing in_interrupt check with the more paranoid might_sleep.
Comments, flames and review highly welcome.
Yours, Daniel
[1]: https://lkml.org/lkml/2012/8/21/36
Daniel Vetter (2):
console: use might_sleep in console_lock
console: implement lockdep support for console_lock
kernel/printk.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--
1.7.10.4
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