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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>
This commit is contained in:
Dmitry Kasatkin 2010-12-29 21:52:04 +11:00 committed by Herbert Xu
parent 8ad225e8e4
commit 6c39d116ba
1 changed files with 3 additions and 4 deletions
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7
drivers/crypto/omap-sham.c
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@ -664,7 +664,7 @@ static void omap_sham_finish_req(struct ahash_request *req, int err)
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 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd,
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)