If edma_terminate_all() was called while a transfer was running (i.e. after
edma_execute() but before edma_callback()) the echan->edesc was not freed.
This was due to the fact that a running transfer is on none of the
vchan lists: desc_submitted, desc_issued, desc_completed (edma_execute()
removes it from the desc_issued list), so the vchan_dma_desc_free_list()
called at the end of edma_terminate_all() didn't find it and didn't free it.
This bug was found on an AM1808 based hardware (very similar to da850evm,
however using the second MMC/SD controller), where intense operations on the SD
card wasted the device 128MB RAM within a couple of days.
Signed-off-by: Petr Kulhavy <petr@xxxxxxxxx>
---
drivers/dma/edma.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 276157f..1465610 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -260,6 +260,14 @@ static int edma_terminate_all(struct dma_chan *chan)
*/
if (echan->edesc) {
int cyclic = echan->edesc->cyclic;
+
+ /*
+ * free the running request descriptor
+ * since it is on none of the vchan lists
+ * desc_submitted, desc_issued, desc_completed
+ */
+ kfree(echan->edesc);
+
echan->edesc = NULL;
edma_stop(echan->ch_num);
/* Move the cyclic channel back to default queue */
--
1.9.1
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