diff options
| author | Fugang Duan <fugang.duan@nxp.com> | 2017-06-15 16:48:31 +0800 |
|---|---|---|
| committer | Jason Liu <jason.hui.liu@nxp.com> | 2019-02-12 10:26:50 +0800 |
| commit | 53edc8bfca0be2eb19453fce18ef13fd7b2c402b (patch) | |
| tree | 3175bcfbe2b990ef666346e72dd37d41426f5375 /drivers/tty | |
| parent | 4d3bd1e2f9b14284aa8190ca28ac97e20935830a (diff) | |
MLK-15094 tty: serial: fsl_lpuart: check dma_tx_in_progress in callback
There have a corner case that tx DMA .callback() is comming 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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index f52f6581aef8..996ff309f258 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -458,6 +458,10 @@ 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(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); |