serial: bfin_5xx: need to disable DMA TX interrupt too

If we don't disable the DMA TX channel, an inopportune timeout will
trigger the interrupt handler and may cause a dead lock with the spin_lock.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 15843cceb9fc..b5a9b374dad5 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -488,6 +488,7 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 {
         int x_pos, pos;
 
+        dma_disable_irq(uart->tx_dma_channel);
         dma_disable_irq(uart->rx_dma_channel);
         spin_lock_bh(&uart->port.lock);
 
@@ -521,6 +522,7 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
         }
 
         spin_unlock_bh(&uart->port.lock);
+        dma_enable_irq(uart->tx_dma_channel);
         dma_enable_irq(uart->rx_dma_channel);
 
         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);