From: Naveen Krishna Chatradhi Subject: [PATCH 9/9] crypto:s5p-sss: Look for the next request in the queue Date: Mon, 17 Feb 2014 15:14:35 +0530 Message-ID: <1392630275-8667-10-git-send-email-ch.naveen@samsung.com> References: <1392630275-8667-1-git-send-email-ch.naveen@samsung.com> Cc: linux-kernel@vger.kernel.org, vzapolskiy@gmail.com, herbert@gondor.apana.org.au, naveenkrishna.ch@gmail.com, cpgs@samsung.com, davem@davemloft.net, Naveen Krishna Ch To: linux-crypto@vger.kernel.org, linux-samsung-soc@vger.kernel.org Return-path: In-reply-to: <1392630275-8667-1-git-send-email-ch.naveen@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org From: Naveen Krishna Ch Currently, the driver enqueues a request only if the busy bit is false. And every request initiates a dequeue. If 2 requests arrive simultaneously, only one of them will be dequeued. To avoid this senario, we will enqueue the next request irrespective of the system condition (that is what queue is here for). Also schedule at a tasklet immediatly after the current request is done. The tasklet will dequeue the next request in the queue, giving continuous loop. tasklet will exit if there are no requests in the queue. Signed-off-by: Naveen Krishna Ch CC: David S. Miller CC: Herbert Xu CC: Vladimir Zapolskiy TO: CC: --- Changes since v6: None drivers/crypto/s5p-sss.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c index 429b4c1..61a80c1 100644 --- a/drivers/crypto/s5p-sss.c +++ b/drivers/crypto/s5p-sss.c @@ -330,8 +330,12 @@ static void s5p_aes_tx(struct s5p_aes_dev *dev) } s5p_set_dma_outdata(dev, dev->sg_dst); - } else + } else { s5p_aes_complete(dev, err); + + dev->busy = true; + tasklet_schedule(&dev->tasklet); + } } static void s5p_aes_rx(struct s5p_aes_dev *dev) @@ -469,10 +473,13 @@ static void s5p_tasklet_cb(unsigned long data) spin_lock_irqsave(&dev->lock, flags); backlog = crypto_get_backlog(&dev->queue); async_req = crypto_dequeue_request(&dev->queue); - spin_unlock_irqrestore(&dev->lock, flags); - if (!async_req) + if (!async_req) { + dev->busy = false; + spin_unlock_irqrestore(&dev->lock, flags); return; + } + spin_unlock_irqrestore(&dev->lock, flags); if (backlog) backlog->complete(backlog, -EINPROGRESS); @@ -491,14 +498,13 @@ static int s5p_aes_handle_req(struct s5p_aes_dev *dev, int err; spin_lock_irqsave(&dev->lock, flags); + err = ablkcipher_enqueue_request(&dev->queue, req); if (dev->busy) { - err = -EAGAIN; spin_unlock_irqrestore(&dev->lock, flags); goto exit; } dev->busy = true; - err = ablkcipher_enqueue_request(&dev->queue, req); spin_unlock_irqrestore(&dev->lock, flags); tasklet_schedule(&dev->tasklet); @@ -688,6 +694,7 @@ static int s5p_aes_probe(struct platform_device *pdev) } } + pdata->busy = false; pdata->variant = variant; pdata->dev = dev; platform_set_drvdata(pdev, pdata); -- 1.7.9.5