From: Vishnu Suresh Subject: [PATCH v0 1/2] DMA: fsldma: Disable DMA_INTERRUPT when Async_tx enabled Date: Thu, 15 Oct 2009 12:11:05 +0530 Message-ID: <1255588866-4133-1-git-send-email-Vishnu@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Vishnu Suresh To: linuxppc-dev@ozlabs.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, herbert@gondor.apana.org.au, dan.j.williams@intel.com Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linuxppc-dev-bounces+glppd-linuxppc64-dev=m.gmane.org@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+glppd-linuxppc64-dev=m.gmane.org@lists.ozlabs.org List-Id: linux-crypto.vger.kernel.org This patch disables the use of DMA_INTERRUPT capability with Async_tx The fsldma produces a null transfer with DMA_INTERRUPT capability when used with Async_tx. When RAID devices queue a transaction via Async_tx, this results in a hang. Signed-off-by: Vishnu Suresh --- drivers/dma/fsldma.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index 296f9e7..66d9b39 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -1200,7 +1200,13 @@ static int __devinit of_fsl_dma_probe(struct of_device *dev, - fdev->reg.start + 1); dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask); +#ifndef CONFIG_ASYNC_CORE + /* + * The DMA_INTERRUPT async_tx is a NULL transfer, which will + * triger a PE interrupt. + */ dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask); +#endif dma_cap_set(DMA_SLAVE, fdev->common.cap_mask); fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources; fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources; -- 1.6.4.2