From mboxrd@z Thu Jan 1 00:00:00 1970 From: okaya@codeaurora.org (Sinan Kaya) Date: Wed, 13 Jul 2016 22:57:56 -0400 Subject: [PATCH] dmaengine: qcom_hidma: release the descriptor before the callback Message-ID: <1468465076-27324-1-git-send-email-okaya@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org There is a race condition between data transfer callback and descriptor free code. The callback routine may decide to clear the resources even though the descriptor has not yet been freed. Instead of calling the callback first and then releasing the memory, this code is changing the order to return the descriptor back to the free pool and then call the user provided callback. Signed-off-by: Sinan Kaya --- drivers/dma/qcom/hidma.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c index 41b5c6d..c41696e 100644 --- a/drivers/dma/qcom/hidma.c +++ b/drivers/dma/qcom/hidma.c @@ -111,6 +111,7 @@ static void hidma_process_completed(struct hidma_chan *mchan) struct dma_async_tx_descriptor *desc; dma_cookie_t last_cookie; struct hidma_desc *mdesc; + struct hidma_desc *next; unsigned long irqflags; struct list_head list; @@ -122,28 +123,31 @@ static void hidma_process_completed(struct hidma_chan *mchan) spin_unlock_irqrestore(&mchan->lock, irqflags); /* Execute callbacks and run dependencies */ - list_for_each_entry(mdesc, &list, node) { - enum dma_status llstat; + list_for_each_entry_safe(mdesc, next, &list, node) { + dma_async_tx_callback callback; + void *param; desc = &mdesc->desc; spin_lock_irqsave(&mchan->lock, irqflags); - dma_cookie_complete(desc); + if (hidma_ll_status(mdma->lldev, mdesc->tre_ch) + == DMA_COMPLETE) + dma_cookie_complete(desc); spin_unlock_irqrestore(&mchan->lock, irqflags); - llstat = hidma_ll_status(mdma->lldev, mdesc->tre_ch); - if (desc->callback && (llstat == DMA_COMPLETE)) - desc->callback(desc->callback_param); + callback = desc->callback; + param = desc->callback_param; last_cookie = desc->cookie; dma_run_dependencies(desc); - } - /* Free descriptors */ - spin_lock_irqsave(&mchan->lock, irqflags); - list_splice_tail_init(&list, &mchan->free); - spin_unlock_irqrestore(&mchan->lock, irqflags); + spin_lock_irqsave(&mchan->lock, irqflags); + list_move(&mdesc->node, &mchan->free); + spin_unlock_irqrestore(&mchan->lock, irqflags); + if (callback) + callback(param); + } } /* -- 1.8.2.1