On 10/24/2012 01:14 PM, Arend van Spriel wrote:
On 10/16/2012 02:43 PM, Stanislaw Gruszka wrote:
I have this lockdep warning on wireless-testing tree based
on 3.7-rc1 (no other patches except wireless bits).
=============================================
Restarting tasks ... done.
[ INFO: possible recursive locking detected ]
3.7.0-rc1-wl+ #2 Not tainted
---------------------------------------------
Xorg/2269 is trying to acquire lock:
(&cli->mutex){+.+.+.}, at: [<ffffffffa012a27f>]
nouveau_bo_move_m2mf+0x5f/0x170 [nouveau]
but task is already holding lock:
(&cli->mutex){+.+.+.}, at: [<ffffffffa012f3c4>]
nouveau_abi16_get+0x34/0x100 [nouveau]
I have observed the same bug so I built and tested v3.7-rc2 tag with
lockdep enabled. It has the same problem and it results in a failure to
resume after suspend. See below.
Gr. AvS
digging into the trace:
nouveau_gem_ioctl_pushbuf() calls nouveau_abi16_get() which grabs the
mutex. Assume this should protect the chan variable passed to
nouveau_gem_pushbuf_validate(), which does a bit more that validate as
it ends up in nouveau_bo_move_m2mf() which uses the drm->chan. However,
it deadlocks before that.
Gr. AvS
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