On Fri, Nov 22, 2013 at 9:12 AM, Liu Gang [off-list ref] wrote:

For MPC8572/MPC8536, the status of GPIOs defined as output
cannot be determined by reading GPDAT register, so the code
use shadow data register instead. But the code may give the
wrong status of GPIOs defined as input under some scenarios:

(...)

Signed-off-by: Liu Gang <redacted>
---
changes in v2:
 - Added more description of the problem.
 - Reduced one in_be32() call.
 - Do not modify the shadow data.

Applied this v2 version, added ACKs and tagged for stable.

Yours,
Linus Walleij