From: Amelie Delaunay <amelie.delaunay@st.com>
To: Vinod Koul <vkoul@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>
Cc: Amelie Delaunay <amelie.delaunay@st.com>,
linux-kernel@vger.kernel.org,
Pierre-Yves MORDRET <pierre-yves.mordret@st.com>,
dmaengine@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 8/8] dmaengine: stm32-dma: use vchan_terminate_vdesc() in .terminate_all
Date: Wed, 29 Jan 2020 16:36:28 +0100 [thread overview]
Message-ID: <20200129153628.29329-9-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200129153628.29329-1-amelie.delaunay@st.com>
To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Move vdesc->node list_del in stm32_dma_start_transfer instead of in
stm32_mdma_chan_complete to avoid another race in vchan_dma_desc_free_list.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
drivers/dma/stm32-dma.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index b585e11c2168..0ddbaa4b4f0b 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -478,8 +478,10 @@ static int stm32_dma_terminate_all(struct dma_chan *c)
spin_lock_irqsave(&chan->vchan.lock, flags);
- if (chan->busy) {
- stm32_dma_stop(chan);
+ if (chan->desc) {
+ vchan_terminate_vdesc(&chan->desc->vdesc);
+ if (chan->busy)
+ stm32_dma_stop(chan);
chan->desc = NULL;
}
@@ -535,6 +537,8 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
if (!vdesc)
return;
+ list_del(&vdesc->node);
+
chan->desc = to_stm32_dma_desc(vdesc);
chan->next_sg = 0;
}
@@ -613,7 +617,6 @@ static void stm32_dma_handle_chan_done(struct stm32_dma_chan *chan)
} else {
chan->busy = false;
if (chan->next_sg == chan->desc->num_sgs) {
- list_del(&chan->desc->vdesc.node);
vchan_cookie_complete(&chan->desc->vdesc);
chan->desc = NULL;
}
--
2.17.1
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next prev parent reply other threads:[~2020-01-29 15:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-29 15:36 [PATCH 0/8] STM32 DMA driver fixes and improvements Amelie Delaunay
2020-01-29 15:36 ` [PATCH 1/8] dmaengine: stm32-dma: add suspend/resume power management support Amelie Delaunay
2020-01-29 15:36 ` [PATCH 2/8] dmaengine: stm32-dma: use reset controller only at probe time Amelie Delaunay
2020-01-29 15:36 ` [PATCH 3/8] dmaengine: stm32-dma: driver defers probe for reset Amelie Delaunay
2020-01-29 15:36 ` [PATCH 4/8] dmaengine: stm32-dma: enable descriptor_reuse Amelie Delaunay
2020-01-29 15:36 ` [PATCH 5/8] dmaengine: stm32-dma: use dma_set_max_seg_size to set the sg limit Amelie Delaunay
2020-01-29 15:36 ` [PATCH 6/8] dmaengine: stm32-dma: add copy_align constraint Amelie Delaunay
2020-01-29 15:36 ` [PATCH 7/8] dmaengine: stm32-dma: fix sleeping function called from invalid context Amelie Delaunay
2020-01-29 15:36 ` Amelie Delaunay [this message]
2020-02-25 5:45 ` [PATCH 0/8] STM32 DMA driver fixes and improvements Vinod Koul
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