@@ -945,8 +945,11 @@ static void atc_advance_work(struct at_dma_chan *atchan)
/* advance work */
spin_lock_irqsave(&atchan->lock, flags);
- if (!list_empty(&atchan->active_list))
- atc_dostart(atchan, atc_first_active(atchan));
+ if (!list_empty(&atchan->active_list)) {
+ desc = atc_first_queued(atchan);
+ list_move_tail(&desc->desc_node, &atchan->active_list);
+ atc_dostart(atchan, desc);
+ }
spin_unlock_irqrestore(&atchan->lock, flags);
}
@@ -958,6 +961,7 @@ static void atc_advance_work(struct at_dma_chan *atchan)
static void atc_handle_error(struct at_dma_chan *atchan)
{
struct at_desc *bad_desc;
+ struct at_desc *desc;
struct at_desc *child;
unsigned long flags;
@@ -975,8 +979,11 @@ static void atc_handle_error(struct at_dma_chan *atchan)
list_splice_init(&atchan->queue, atchan->active_list.prev);
/* Try to restart the controller */
- if (!list_empty(&atchan->active_list))
- atc_dostart(atchan, atc_first_active(atchan));
+ if (!list_empty(&atchan->active_list)) {
+ desc = atc_first_queued(atchan);
+ list_move_tail(&desc->desc_node, &atchan->active_list);
+ atc_dostart(atchan, desc);
+ }
/*
* KERN_CRITICAL may seem harsh, but since this only happens
As it was before, the descriptor was issued to the hardware without adding it to the active (issued) list. This could result in a completion of other descriptor, or/and in the descriptor never being completed. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Cc: stable@vger.kernel.org Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ --- drivers/dma/at_hdmac.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)