diff options
| author | Fugang Duan <fugang.duan@nxp.com> | 2017-06-15 16:48:31 +0800 |
|---|---|---|
| committer | Dong Aisheng <aisheng.dong@nxp.com> | 2019-11-25 15:45:24 +0800 |
| commit | d44a60d517d962295164ec40c7e220ef61c0dc54 (patch) | |
| tree | 29d11fe228f6481b6256b0ea98613e118b4c78b0 /drivers/tty | |
| parent | 12ad8eef8490f897b674c16a96384da9789fd1f9 (diff) | |
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>
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 b966e989ac2d..7f6c0c484c6f 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -489,6 +489,10 @@ 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); |