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- From 31a4e41820cdaad9d4c151beefe5ab0698f4865a Mon Sep 17 00:00:00 2001
- From: Fugang Duan <[email protected]>
- 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 <[email protected]>
- Signed-off-by: Vipul Kumar <[email protected]>
- ---
- 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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