tree 1b1306360019360b23b60c56b86a38a55284ea07
parent 0475add3c27a43a6599fe6338f8fffe919a13547
author Jamie Iles <jamie@jamieiles.com> 1301194109 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1301194109 +0800

crypto: picoxcell - fix possible status FIFO overflow

The SPAcc's have 2 equally sized FIFO's - a command FIFO and a status
FIFO.  The command FIFO takes the requests that are to be performed and
the status FIFO reports the results.  It is possible to get into the
situation where there are more free spaces in the command FIFO than the
status FIFO if we don't empty the status FIFO quickly enough resulting
in a possible overflow of the status FIFO.  This can result in incorrect
status being reported in the status FIFO.

Make sure that when we are submitting requests the number of requests
that have been dispatched but not yet popped from the status FIFO does
not exceed the size of a single FIFO.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>