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... and so prevent a potential circular reference: [ INFO: possible circular locking dependency detected ] 2.6.37-rc1-uwe1+ #4 ------------------------------------------------------- Xorg/1401 is trying to acquire lock: (&mm->mmap_sem){++++++}, at: [<c01e4ddb>] might_fault+0x4b/0xa0 but task is already holding lock: (&dev->struct_mutex){+.+.+.}, at: [<f869c3ac>] i915_mutex_lock_interruptible+0x3c/0x60 [i915] which lock already depends on the new lock. When the locking around the pwrite ioctl was simplified, I did not spot that the phys path never took any locks and so we introduced this potential circular reference. Reported-by: Uwe Helm <uwe.helm@googlemail.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> |
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