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Code Issues Releases Wiki Activity

dmaengine: at_hdmac: Fix descriptor handling when issuing it to hardware

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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: dc78baa2b9 ("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/20221025090306.297886-12-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Tudor Ambarus 2022-10-25 12:02:45 +03:00 committed by Vinod Koul
parent 03ed9ba357
commit ba2423633b
1 changed files with 11 additions and 4 deletions
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15
drivers/dma/at_hdmac.c
View file

@ -510,8 +510,11 @@ 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);
}
@ -523,6 +526,7 @@ 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;
@ -540,8 +544,11 @@ 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