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i915_gem: return -EFAULT if copy_to_user fails
commit c877cdc upstream. copy_to_user() returns the number of bytes remaining to be copied and I'm pretty sure we want to return a negative error code here. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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