diff options
| author |   Fugang Duan <fugang.duan@nxp.com> | 2021-08-17 18:02:03 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-18 16:05:27 +0200 |
| commit | 88c1d2478ec8a420cf60a3c25503e37b34fea5aa (patch) | |
| tree | 4560aea876860da77a1c43c14bafe8df0a77ba54 /drivers/tty | |
| parent | tty: replace in_irq() with in_hardirq() (diff) | |
| download | linux-dev-88c1d2478ec8a420cf60a3c25503e37b34fea5aa.tar.xz linux-dev-88c1d2478ec8a420cf60a3c25503e37b34fea5aa.zip | |
tty: serial: fsl_lpuart: check dma_tx_in_progress in tx dma 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>
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>
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 f0e5da77ed6d..31d715c4787a 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -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); |