[PATCH] mutex: fix deadlock injection

[Peter Zijlstra]

On Tue, Jul 30, 2013 at 10:13:41AM +0200, Maarten Lankhorst wrote:
> The check needs to be for > 1, because ctx->acquired is already incremented.
> This will prevent ww_mutex_lock_slow from returning -EDEADLK and not locking
> the mutex. It caused a lot of false gpu lockups on radeon with
> CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y because a function that shouldn't be able
> to return -EDEADLK did.
> 
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>

Thanks!