[PATCHv3 4/8] dmaengine: ti: omap-dma: stop channels during teardown

[Rosen Penev <rosenp@gmail.com>]

omap_dma_free() removes channels and frees their storage without
first stopping an active transfer. A channel may have moved the
active descriptor out of the virt-dma lists into c->desc, so freeing
only the list state can leave hardware running against descriptor
memory that is about to disappear.

Terminate each channel before removing it, then drain the virt-dma
resource lists before freeing the channel structure.

Fixes: 7bedaa553760 ("dmaengine: add OMAP DMA engine driver")
Cc: stable@vger.kernel.org
Assisted-by: Codex:GPT-5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/dma/ti/omap-dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/ti/omap-dma.c b/drivers/dma/ti/omap-dma.c
index 0ad8da8b35f8..cef4e3a38b04 100644
--- a/drivers/dma/ti/omap-dma.c
+++ b/drivers/dma/ti/omap-dma.c
@@ -1521,8 +1521,10 @@ static void omap_dma_free(struct omap_dmadev *od)
 		struct omap_chan *c = list_first_entry(&od->ddev.channels,
 			struct omap_chan, vc.chan.device_node);
 
+		omap_dma_terminate_all(&c->vc.chan);
 		list_del(&c->vc.chan.device_node);
 		tasklet_kill(&c->vc.task);
+		vchan_free_chan_resources(&c->vc);
 		kfree(c);
 	}
 }
-- 
2.54.0