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authorDmitry Kasatkin <dmitry.kasatkin@nokia.com>2010-11-19 16:04:25 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2010-11-27 16:37:17 +0800
commita5d87237bb15eed8449e5a30c0bbe626e0e7f43d (patch)
treeefa77f435272006e9ae802cf2c8d13a58997138a /drivers/crypto/omap-sham.c
parent3e133c8bf6a6723377d94bc97aa52596e49a4090 (diff)
crypto: omap-sham - removed redundunt locking
Locking for queuing and dequeuing is combined. test_and_set_bit() is also replaced with checking under dd->lock. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/omap-sham.c')
-rw-r--r--drivers/crypto/omap-sham.c47
1 files changed, 21 insertions, 26 deletions
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index db206284835..6340c5ef471 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -84,9 +84,7 @@
#define FLAGS_CPU 0x0200
#define FLAGS_HMAC 0x0400
#define FLAGS_ERROR 0x0800
-
-/* 3rd byte */
-#define FLAGS_BUSY 16
+#define FLAGS_BUSY 0x1000
#define OP_UPDATE 1
#define OP_FINAL 2
@@ -629,32 +627,37 @@ static void omap_sham_finish_req(struct ahash_request *req, int err)
if ((ctx->flags & FLAGS_FINAL) || err)
omap_sham_cleanup(req);
- clear_bit(FLAGS_BUSY, &ctx->dd->flags);
+ ctx->dd->flags &= ~FLAGS_BUSY;
if (req->base.complete)
req->base.complete(&req->base, err);
}
-static int omap_sham_handle_queue(struct omap_sham_dev *dd)
+static int omap_sham_handle_queue(struct omap_sham_dev *dd,
+ struct ahash_request *req)
{
struct crypto_async_request *async_req, *backlog;
struct omap_sham_reqctx *ctx;
- struct ahash_request *req, *prev_req;
+ struct ahash_request *prev_req;
unsigned long flags;
- int err = 0;
-
- if (test_and_set_bit(FLAGS_BUSY, &dd->flags))
- return 0;
+ int err = 0, ret = 0;
spin_lock_irqsave(&dd->lock, flags);
- backlog = crypto_get_backlog(&dd->queue);
+ if (req)
+ ret = ahash_enqueue_request(&dd->queue, req);
+ if (dd->flags & FLAGS_BUSY) {
+ spin_unlock_irqrestore(&dd->lock, flags);
+ return ret;
+ }
async_req = crypto_dequeue_request(&dd->queue);
- if (!async_req)
- clear_bit(FLAGS_BUSY, &dd->flags);
+ if (async_req) {
+ dd->flags |= FLAGS_BUSY;
+ backlog = crypto_get_backlog(&dd->queue);
+ }
spin_unlock_irqrestore(&dd->lock, flags);
if (!async_req)
- return 0;
+ return ret;
if (backlog)
backlog->complete(backlog, -EINPROGRESS);
@@ -690,7 +693,7 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd)
dev_dbg(dd->dev, "exit, err: %d\n", err);
- return err;
+ return ret;
}
static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
@@ -698,18 +701,10 @@ static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
struct omap_sham_dev *dd = tctx->dd;
- unsigned long flags;
- int err;
ctx->op = op;
- spin_lock_irqsave(&dd->lock, flags);
- err = ahash_enqueue_request(&dd->queue, req);
- spin_unlock_irqrestore(&dd->lock, flags);
-
- omap_sham_handle_queue(dd);
-
- return err;
+ return omap_sham_handle_queue(dd, req);
}
static int omap_sham_update(struct ahash_request *req)
@@ -1041,7 +1036,7 @@ static void omap_sham_done_task(unsigned long data)
/* finish curent request */
omap_sham_finish_req(req, err);
/* start new request */
- omap_sham_handle_queue(dd);
+ omap_sham_handle_queue(dd, NULL);
}
}
@@ -1049,7 +1044,7 @@ static void omap_sham_queue_task(unsigned long data)
{
struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
- omap_sham_handle_queue(dd);
+ omap_sham_handle_queue(dd, NULL);
}
static irqreturn_t omap_sham_irq(int irq, void *dev_id)