crypto: cavium/nitrox - Invoke callback after DMA unmap

In process_response_list() invoke the callback handler after unmapping
the DMA buffers. It ensures DMA data is synced form device to cpu
before the client code access the data from callback handler.

Fixes: c9613335bf4f ("crypto: cavium/nitrox - Added AEAD cipher support")
Signed-off-by: Nagadheeraj Rottela <rnagadheeraj@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c b/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
index fe070d75c842..4c97478d44bd 100644
--- a/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
+++ b/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
@@ -537,6 +537,8 @@ static void process_response_list(struct nitrox_cmdq *cmdq)
         struct nitrox_device *ndev = cmdq->ndev;
         struct nitrox_softreq *sr;
         int req_completed = 0, err = 0, budget;
+        completion_t callback;
+        void *cb_arg;
 
         /* check all pending requests */
         budget = atomic_read(&cmdq->pending_count);
@@ -564,13 +566,13 @@ static void process_response_list(struct nitrox_cmdq *cmdq)
                 smp_mb__after_atomic();
                 /* remove from response list */
                 response_list_del(sr, cmdq);
-
                 /* ORH error code */
                 err = READ_ONCE(*sr->resp.orh) & 0xff;
-
-                if (sr->callback)
-                        sr->callback(sr->cb_arg, err);
+                callback = sr->callback;
+                cb_arg = sr->cb_arg;
                 softreq_destroy(sr);
+                if (callback)
+                        callback(cb_arg, err);
 
                 req_completed++;
         }