diff mbox series

dmaengine: sprd: Fix the possible memory leak issue

Message ID 170dbbc6d5366b6fa974ce2d366652e23a334251.1570609788.git.baolin.wang@linaro.org
State Accepted
Commit ec1ac309596a7bdf206743b092748205f6cd5720
Headers show
Series dmaengine: sprd: Fix the possible memory leak issue | expand

Commit Message

(Exiting) Baolin Wang Oct. 9, 2019, 9:11 a.m. UTC 
If we terminate the channel to free all descriptors associated with this
channel, we will leak the memory of current descriptor if the current
descriptor is not completed, since it had been deteled from the desc_issued
list and have not been added into the desc_completed list.

Thus we should check if current descriptor is completed or not, when freeing
the descriptors associated with one channel, if not, we should free it to
avoid this issue.

Fixes: 9b3b8171f7f4 ("dmaengine: sprd: Add Spreadtrum DMA driver")
Reported-by: Zhenfang Wang <zhenfang.wang@unisoc.com>
Tested-by: Zhenfang Wang <zhenfang.wang@unisoc.com>

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>

---
 drivers/dma/sprd-dma.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

-- 
1.7.9.5

Comments

Vinod Koul Oct. 15, 2019, 10:17 a.m. UTC | #1 
On 09-10-19, 17:11, Baolin Wang wrote:
> If we terminate the channel to free all descriptors associated with this

> channel, we will leak the memory of current descriptor if the current

> descriptor is not completed, since it had been deteled from the desc_issued

> list and have not been added into the desc_completed list.

> 

> Thus we should check if current descriptor is completed or not, when freeing

> the descriptors associated with one channel, if not, we should free it to

> avoid this issue.


Applied, thanks

-- 
~Vinod
diff mbox series

Patch

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 60d2c6b..32402c2 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -212,6 +212,7 @@  struct sprd_dma_dev {
 	struct sprd_dma_chn	channels[0];
 };
 
+static void sprd_dma_free_desc(struct virt_dma_desc *vd);
 static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param);
 static struct of_dma_filter_info sprd_dma_info = {
 	.filter_fn = sprd_dma_filter_fn,
@@ -613,12 +614,19 @@  static int sprd_dma_alloc_chan_resources(struct dma_chan *chan)
 static void sprd_dma_free_chan_resources(struct dma_chan *chan)
 {
 	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+	struct virt_dma_desc *cur_vd = NULL;
 	unsigned long flags;
 
 	spin_lock_irqsave(&schan->vc.lock, flags);
+	if (schan->cur_desc)
+		cur_vd = &schan->cur_desc->vd;
+
 	sprd_dma_stop(schan);
 	spin_unlock_irqrestore(&schan->vc.lock, flags);
 
+	if (cur_vd)
+		sprd_dma_free_desc(cur_vd);
+
 	vchan_free_chan_resources(&schan->vc);
 	pm_runtime_put(chan->device->dev);
 }
@@ -1031,15 +1039,22 @@  static int sprd_dma_resume(struct dma_chan *chan)
 static int sprd_dma_terminate_all(struct dma_chan *chan)
 {
 	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+	struct virt_dma_desc *cur_vd = NULL;
 	unsigned long flags;
 	LIST_HEAD(head);
 
 	spin_lock_irqsave(&schan->vc.lock, flags);
+	if (schan->cur_desc)
+		cur_vd = &schan->cur_desc->vd;
+
 	sprd_dma_stop(schan);
 
 	vchan_get_all_descriptors(&schan->vc, &head);
 	spin_unlock_irqrestore(&schan->vc.lock, flags);
 
+	if (cur_vd)
+		sprd_dma_free_desc(cur_vd);
+
 	vchan_dma_desc_free_list(&schan->vc, &head);
 	return 0;
 }