crypto: omap-sham - avoid executing tasklet where not needed
Some of the call paths of OMAP SHA driver can avoid executing the next
step of the crypto queue under tasklet; instead, execute the next step
directly via function call. This avoids a costly round-trip via the
scheduler giving a slight performance boost.
Signed-off-by: Tero Kristo <t-kristo@ti.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 7fe4eef..fd50005 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -1005,9 +1005,6 @@
if (req->base.complete)
req->base.complete(&req->base, err);
-
- /* handle new request */
- tasklet_schedule(&dd->done_task);
}
static int omap_sham_handle_queue(struct omap_sham_dev *dd,
@@ -1018,6 +1015,7 @@
unsigned long flags;
int err = 0, ret = 0;
+retry:
spin_lock_irqsave(&dd->lock, flags);
if (req)
ret = ahash_enqueue_request(&dd->queue, req);
@@ -1061,11 +1059,19 @@
err = omap_sham_final_req(dd);
}
err1:
- if (err != -EINPROGRESS)
+ dev_dbg(dd->dev, "exit, err: %d\n", err);
+
+ if (err != -EINPROGRESS) {
/* done_task will not finish it, so do it here */
omap_sham_finish_req(req, err);
+ req = NULL;
- dev_dbg(dd->dev, "exit, err: %d\n", err);
+ /*
+ * Execute next request immediately if there is anything
+ * in queue.
+ */
+ goto retry;
+ }
return ret;
}
@@ -1653,6 +1659,10 @@
dev_dbg(dd->dev, "update done: err: %d\n", err);
/* finish curent request */
omap_sham_finish_req(dd->req, err);
+
+ /* If we are not busy, process next req */
+ if (!test_bit(FLAGS_BUSY, &dd->flags))
+ omap_sham_handle_queue(dd, NULL);
}
static irqreturn_t omap_sham_irq_common(struct omap_sham_dev *dd)