crypto: omap-sham - backlog handling fix
Previous commit "removed redundant locking" introduced
a bug in handling backlog.
In certain cases, when async request complete callback will
call complete() on -EINPROGRESS code, it will cause uncompleted requests.
It does not happen in implementation similar to crypto test manager,
but it will happen in implementation similar to dm-crypt.
Backlog needs to be checked before dequeuing next request.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index eb988e7..2e71123 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -664,7 +664,7 @@
static int omap_sham_handle_queue(struct omap_sham_dev *dd,
struct ahash_request *req)
{
- struct crypto_async_request *async_req, *backlog = 0;
+ struct crypto_async_request *async_req, *backlog;
struct omap_sham_reqctx *ctx;
struct ahash_request *prev_req;
unsigned long flags;
@@ -677,11 +677,10 @@
spin_unlock_irqrestore(&dd->lock, flags);
return ret;
}
+ backlog = crypto_get_backlog(&dd->queue);
async_req = crypto_dequeue_request(&dd->queue);
- if (async_req) {
+ if (async_req)
dd->flags |= FLAGS_BUSY;
- backlog = crypto_get_backlog(&dd->queue);
- }
spin_unlock_irqrestore(&dd->lock, flags);
if (!async_req)