58f44e86b08985431f79d67733963780712f2f4c
[openwrt/staging/robimarko.git] /
1 From 31a4e41820cdaad9d4c151beefe5ab0698f4865a Mon Sep 17 00:00:00 2001
2 From: Fugang Duan <fugang.duan@nxp.com>
3 Date: Thu, 15 Jun 2017 16:48:31 +0800
4 Subject: [PATCH] MLK-15094 tty: serial: fsl_lpuart: check dma_tx_in_progress
5 in callback
6
7 There have a corner case that tx DMA .callback() is coming after
8 .flush_buffer(), then .callback() should check dma_tx_in_progress
9 flag and return in directly.
10
11 Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
12 Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
13 ---
14 drivers/tty/serial/fsl_lpuart.c | 4 ++++
15 1 file changed, 4 insertions(+)
16
17 --- a/drivers/tty/serial/fsl_lpuart.c
18 +++ b/drivers/tty/serial/fsl_lpuart.c
19 @@ -490,6 +490,10 @@ static void lpuart_dma_tx_complete(void
20 unsigned long flags;
21
22 spin_lock_irqsave(&sport->port.lock, flags);
23 + if (!sport->dma_tx_in_progress) {
24 + spin_unlock_irqrestore(&sport->port.lock, flags);
25 + return;
26 + }
27
28 dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
29