crypto: ccp - Prevent a possible lost CCP command request

If a CCP command has been queued for processing at the
crypto layer then, when dequeueing it for processing, the
"can backlog" flag must be set so that the request isn't
lost if the CCP backlog queue limit is reached.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/ccp-crypto-main.c b/drivers/crypto/ccp/ccp-crypto-main.c
index 010fded5d46b..9d30d6fbfd3d 100644
--- a/drivers/crypto/ccp/ccp-crypto-main.c
+++ b/drivers/crypto/ccp/ccp-crypto-main.c
@@ -174,6 +174,10 @@ static void ccp_crypto_complete(void *data, int err)
 
         /* Submit the next cmd */
         while (held) {
+                /* Since we have already queued the cmd, we must indicate that
+                 * we can backlog so as not to "lose" this request.
+                 */
+                held->cmd->flags |= CCP_CMD_MAY_BACKLOG;
                 ret = ccp_enqueue_cmd(held->cmd);
                 if (ccp_crypto_success(ret))
                         break;