Hello, I was wondering about the call to copy_from_user in function submit_lookup_objects for drive /gpu/drm/msm/msm_gem_submit.c It calls copy_from_user[1] in a spin_lock, which is not normally allowed, due to the possibility of a deadlock.
Is there some reason that I am overlooking why it is OK in this case? Is there some code in the same file which ensures that page fault will not occur when we are calling the function holding spin_lock? Thank you. [1] http://lxr.free-electrons.com/source/drivers/gpu/drm/msm/msm_gem_submit.c#L85 -- Vaishali
