Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753447Ab1EIIQ1 (ORCPT ); Mon, 9 May 2011 04:16:27 -0400 Received: from eu1sys200aog106.obsmtp.com ([207.126.144.121]:51732 "EHLO eu1sys200aog106.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750959Ab1EIIQS (ORCPT ); Mon, 9 May 2011 04:16:18 -0400 From: Viresh Kumar To: , Cc: , , , , , Viresh Kumar Subject: [PATCH V5 1/5] dmaengine/dw_dmac: don't call callback routine in case dmaengine_terminate_all() is called Date: Mon, 9 May 2011 13:45:49 +0530 Message-ID: <904ad0fb1409a0940518ce6b54ff1c8b733c9788.1304928776.git.viresh.kumar@st.com> X-Mailer: git-send-email 1.7.2.2 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3205 Lines: 97 If dmaengine_terminate_all() is called for dma channel, then it doesn't make much sense to call registered callback routine. While in case of success or failure it must be called. Signed-off-by: Viresh Kumar --- drivers/dma/dw_dmac.c | 27 +++++++++++++-------------- 1 files changed, 13 insertions(+), 14 deletions(-) diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 1bd4803..77fd01c7 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -195,18 +195,21 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first) /*----------------------------------------------------------------------*/ static void -dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) +dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc, + bool callback_required) { - dma_async_tx_callback callback; - void *param; + dma_async_tx_callback callback = NULL; + void *param = NULL; struct dma_async_tx_descriptor *txd = &desc->txd; struct dw_desc *child; dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie); dwc->completed = txd->cookie; - callback = txd->callback; - param = txd->callback_param; + if (callback_required) { + callback = txd->callback; + param = txd->callback_param; + } dwc_sync_desc_for_cpu(dwc, desc); @@ -238,11 +241,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) } } - /* - * The API requires that no submissions are done from a - * callback, so we don't need to drop the lock here - */ - if (callback) + if (callback_required && callback) callback(param); } @@ -272,7 +271,7 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc) } list_for_each_entry_safe(desc, _desc, &list, desc_node) - dwc_descriptor_complete(dwc, desc); + dwc_descriptor_complete(dwc, desc, true); } static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) @@ -322,7 +321,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) * No descriptors so far seem to be in progress, i.e. * this one must be done. */ - dwc_descriptor_complete(dwc, desc); + dwc_descriptor_complete(dwc, desc, true); } dev_dbg(chan2dev(&dwc->chan), @@ -384,7 +383,7 @@ static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc) dwc_dump_lli(dwc, &child->lli); /* Pretend the descriptor completed successfully */ - dwc_descriptor_complete(dwc, bad_desc); + dwc_descriptor_complete(dwc, bad_desc, true); } /* --------------------- Cyclic DMA API extensions -------------------- */ @@ -831,7 +830,7 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, /* Flush all pending and queued descriptors */ list_for_each_entry_safe(desc, _desc, &list, desc_node) - dwc_descriptor_complete(dwc, desc); + dwc_descriptor_complete(dwc, desc, false); return 0; } -- 1.7.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/