From 4e7813a0b2aebb210416a418595ceb91ba4e5a37 Mon Sep 17 00:00:00 2001 From: Tero Kristo Date: Thu, 4 Aug 2016 13:28:36 +0300 Subject: [PATCH] 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 Signed-off-by: Herbert Xu --- drivers/crypto/omap-sham.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index 7fe4eef12fe2..fd50005fd942 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -1005,9 +1005,6 @@ static void omap_sham_finish_req(struct ahash_request *req, int err) 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 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd, 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 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd, 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 @@ static void omap_sham_done_task(unsigned long data) 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)