From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: [PATCH 3.19 062/101] dmaengine: edma: fix memory leak when terminating running transfers Date: Fri, 17 Apr 2015 15:28:50 +0200 Message-ID: <20150417132517.081653392@linuxfoundation.org> References: <20150417132514.379828774@linuxfoundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Return-path: In-Reply-To: <20150417132514.379828774@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Petr Kulhavy , Peter Ujfalusi , linux-omap@vger.kernel.org, Vinod Koul List-Id: linux-omap@vger.kernel.org 3.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Petr Kulhavy 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 Signed-off-by: Peter Ujfalusi CC: Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/dma/edma.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -258,6 +258,13 @@ static int edma_terminate_all(struct edm */ if (echan->edesc) { int cyclic = echan->edesc->cyclic; + + /* + * free the running request descriptor + * since it is not in any of the vdesc lists + */ + edma_desc_free(&echan->edesc->vdesc); + echan->edesc = NULL; edma_stop(echan->ch_num); /* Move the cyclic channel back to default queue */