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From 31a4e41820cdaad9d4c151beefe5ab0698f4865a Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
Date: Thu, 15 Jun 2017 16:48:31 +0800
Subject: [PATCH] MLK-15094 tty: serial: fsl_lpuart: check dma_tx_in_progress
in callback
There have a corner case that tx DMA .callback() is coming after
.flush_buffer(), then .callback() should check dma_tx_in_progress
flag and return in directly.
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
---
drivers/tty/serial/fsl_lpuart.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -505,6 +505,10 @@ static void lpuart_dma_tx_complete(void
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
+ if (!sport->dma_tx_in_progress) {
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+ return;
+ }
dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
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