[3.13.y-ckt,52/90] dmaengine: edma: fix memory leak when terminating running transfers
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Message ID 1430859302-5886-53-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa May 5, 2015, 8:54 p.m. UTC
3.13.11-ckt20 -stable review patch.  If anyone has any objections, please let me know.


From: Petr Kulhavy <petr@barix.com>

commit 5ca9e7ce6eebec53362ff779264143860ccf68cd upstream.

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.

Peter Ujfalusi:
The issue is even more severe since it affects cyclic (audio) transfers as
well. In this case starting/stopping audio will results memory leak.

Signed-off-by: Petr Kulhavy <petr@barix.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
CC: <linux-omap@vger.kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
 drivers/dma/edma.c | 6 ++++++
 1 file changed, 6 insertions(+)

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diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 037443c..52a3884 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -219,6 +219,12 @@  static int edma_terminate_all(struct edma_chan *echan)
 	 * echan->edesc is NULL and exit.)
 	if (echan->edesc) {
+		/*
+		 * free the running request descriptor
+		 * since it is not in any of the vdesc lists
+		 */
+		edma_desc_free(&echan->edesc->vdesc);
 		echan->edesc = NULL;