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30 lines
973 B
Diff
30 lines
973 B
Diff
From 31a4e41820cdaad9d4c151beefe5ab0698f4865a Mon Sep 17 00:00:00 2001
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From: Fugang Duan <fugang.duan@nxp.com>
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Date: Thu, 15 Jun 2017 16:48:31 +0800
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Subject: [PATCH] MLK-15094 tty: serial: fsl_lpuart: check dma_tx_in_progress
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in callback
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There have a corner case that tx DMA .callback() is coming after
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.flush_buffer(), then .callback() should check dma_tx_in_progress
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flag and return in directly.
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Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
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Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
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---
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drivers/tty/serial/fsl_lpuart.c | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/drivers/tty/serial/fsl_lpuart.c
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+++ b/drivers/tty/serial/fsl_lpuart.c
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@@ -490,6 +490,10 @@ static void lpuart_dma_tx_complete(void
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unsigned long flags;
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spin_lock_irqsave(&sport->port.lock, flags);
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+ if (!sport->dma_tx_in_progress) {
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+ spin_unlock_irqrestore(&sport->port.lock, flags);
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+ return;
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+ }
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dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
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