dmaengine: at_hdmac: Don't start transactions at tx_submit level

commit 7176a6a8982d311e50a7c1168868d26e65bbba19 upstream.

tx_submit is supposed to push the current transaction descriptor to a
pending queue, waiting for issue_pending() to be called. issue_pending()
must start the transfer, not tx_submit(), thus remove atc_dostart() from
atc_tx_submit(). Clients of at_xdmac that assume that tx_submit() starts
the transfer must be updated and call dma_async_issue_pending() if they
miss to call it.
The vdbg print was moved to after the lock is released. It is desirable to
do the prints without the lock held if possible, and because the if
statement disappears there's no reason why to do the print while holding
the lock.

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/20221025090306.297886-3-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 cb72b8c915c73e0a8977b268dc0a218096e6bdb8..2cb29876f4677e6682a63c6a683b067ad02ffcd1 100644 (file)
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -681,19 +681,11 @@ static dma_cookie_t atc_tx_submit(struct dma_async_tx_descriptor *tx)
        spin_lock_irqsave(&atchan->lock, flags);
        cookie = dma_cookie_assign(tx);
 
-       if (list_empty(&atchan->active_list)) {
-               dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n",
-                               desc->txd.cookie);
-               atc_dostart(atchan, desc);
-               list_add_tail(&desc->desc_node, &atchan->active_list);
-       } else {
-               dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n",
-                               desc->txd.cookie);
-               list_add_tail(&desc->desc_node, &atchan->queue);
-       }
-
+       list_add_tail(&desc->desc_node, &atchan->queue);
        spin_unlock_irqrestore(&atchan->lock, flags);
 
+       dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n",
+                desc->txd.cookie);
        return cookie;
 }