tree 250ae0ae69c525356cc38de12872a6ac3defac41
parent 37ff02acaa3d7be87ecb89f198a549ffd3ae2403
author Jan Glauber <jglauber@cavium.com> 1523288751 +0200
committer Herbert Xu <herbert@gondor.apana.org.au> 1524243515 +0800

crypto: cavium - Limit result reading attempts

After issuing a request an endless loop was used to read the
completion state from memory which is asynchronously updated
by the ZIP coprocessor.

Add an upper bound to the retry attempts to prevent a CPU getting stuck
forever in case of an error. Additionally, add a read memory barrier
and a small delay between the reading attempts.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Reviewed-by: Robert Richter <rrichter@cavium.com>
Cc: stable <stable@vger.kernel.org> # 4.14
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>