serial: 8250: Fix thread unsafe __dma_tx_complete function

__dma_tx_complete is not protected against concurrent
call of serial8250_tx_dma. it can lead to circular tail
index corruption or parallel call of serial_tx_dma on the
same data portion.

This patch fixes this issue by holding the port lock.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 7046769608d4..ab9096dc3849 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -20,12 +20,15 @@ static void __dma_tx_complete(void *param)
         struct uart_8250_port   *p = param;
         struct uart_8250_dma    *dma = p->dma;
         struct circ_buf         *xmit = &p->port.state->xmit;
-
-        dma->tx_running = 0;
+        unsigned long   flags;
 
         dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr,
                                 UART_XMIT_SIZE, DMA_TO_DEVICE);
 
+        spin_lock_irqsave(&p->port.lock, flags);
+
+        dma->tx_running = 0;
+
         xmit->tail += dma->tx_size;
         xmit->tail &= UART_XMIT_SIZE - 1;
         p->port.icount.tx += dma->tx_size;
@@ -35,6 +38,8 @@ static void __dma_tx_complete(void *param)
 
         if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port))
                 serial8250_tx_dma(p);
+
+        spin_unlock_irqrestore(&p->port.lock, flags);
 }
 
 static void __dma_rx_complete(void *param)