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

commit ef2cb4f0ce479f77607b04c4b0414bf32f863ee8 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 4cb768f..6996fee 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);