diff options
| author | Fugang Duan <fugang.duan@nxp.com> | 2017-06-15 16:48:31 +0800 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:41:33 +0300 |
| commit | eb3f2cce73922c5fa4e87dd086032310f12d488d (patch) | |
| tree | 72721fd3f6b91d93320ad47b51a3304aa04d7612 /drivers/tty/serial | |
| parent | 52f8658b5b44760d0c1f4035becb4da7a560f873 (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/serial')
| -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 db6067238278..47ee62e4664a 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -424,6 +424,10 @@ 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); |