dmaengine: at_hdmac: Fix completion of unissued descriptor in case of errors

In case the controller detected an error, the code took the chance to move
all the queued (submitted) descriptors to the active (issued) list. This
was wrong as if there were any descriptors in the submitted list they were
moved to the issued list without actually issuing them to the controller,
thus a completion could be raised without even fireing the descriptor.

Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller")
Reported-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com
Link: https://lore.kernel.org/r/20221025090306.297886-13-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 9e5a30396c1c10245673e79b42c7e1db2bb967ef..80eeb4fb88efd5ad4f76ffcc6847384cd4a5d4a7 100644 (file)
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -539,10 +539,6 @@ static void atc_handle_error(struct at_dma_chan *atchan)
        bad_desc = atc_first_active(atchan);
        list_del_init(&bad_desc->desc_node);
 
-       /* As we are stopped, take advantage to push queued descriptors
-        * in active_list */
-       list_splice_init(&atchan->queue, atchan->active_list.prev);
-
        /* Try to restart the controller */
        if (!list_empty(&atchan->active_list)) {
                desc = atc_first_queued(atchan);