FAILED: patch "[PATCH] serial: amba-pl011: synchronize DMA teardown" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 440915499231e9db1c361aa45bb702e8fd3b4a32
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026081745-cufflink-twiddle-15f3@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 440915499231e9db1c361aa45bb702e8fd3b4a32 Mon Sep 17 00:00:00 2001
From: Fan Wu <[email protected]>
Date: Fri, 31 Jul 2026 08:59:15 +0000
Subject: [PATCH] serial: amba-pl011: synchronize DMA teardown

dmaengine_terminate_all() does not wait for a running callback, so the TX
callback can still touch the TX buffer after it is freed. The RX poll
timer reads the RX buffers without the port lock.

Switch to dmaengine_terminate_sync() and delete the RX timer before
freeing the buffers.

Fixes: ead76f329f77 ("ARM: 6763/1: pl011: add optional RX DMA to PL011 v2")
Cc: stable <[email protected]>
Assisted-by: Codex:gpt-5.6
Signed-off-by: Fan Wu <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 5232042fdd92..9abaeecd05fc 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1247,7 +1247,7 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap)
 
 	if (uap->using_tx_dma) {
 		/* In theory, this should already be done by pl011_dma_flush_buffer */
-		dmaengine_terminate_all(uap->dmatx.chan);
+		dmaengine_terminate_sync(uap->dmatx.chan);
 		if (uap->dmatx.queued) {
 			dma_unmap_single(uap->dmatx.chan->device->dev,
 					 uap->dmatx.dma, uap->dmatx.len,
@@ -1260,12 +1260,12 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap)
 	}
 
 	if (uap->using_rx_dma) {
-		dmaengine_terminate_all(uap->dmarx.chan);
+		if (uap->dmarx.poll_rate)
+			timer_delete_sync(&uap->dmarx.timer);
+		dmaengine_terminate_sync(uap->dmarx.chan);
 		/* Clean up the RX DMA */
 		pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_a, DMA_FROM_DEVICE);
 		pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_b, DMA_FROM_DEVICE);
-		if (uap->dmarx.poll_rate)
-			timer_delete_sync(&uap->dmarx.timer);
 		uap->using_rx_dma = false;
 	}
 }