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tty: serial: fsl_lpuart: check dma_tx_in_progress in tx dma callback

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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>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20210817100203.21300-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fugang Duan 2021-08-17 18:02:03 +08:00 committed by Greg Kroah-Hartman
parent 1143637f00
commit 88c1d2478e
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/fsl_lpuart.c
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@ -479,6 +479,10 @@ static void lpuart_dma_tx_complete(void *arg)
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(chan->device->dev, sgl, sport->dma_tx_nents,
DMA_TO_DEVICE);