Blackfin Serial Driver: Fix bug - BF527-EZKIT unable to receive large files over UART in DMA mode

Add spin_lock_irqsave() when receive and transfer data.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 88449d36a3f7..1c85039d021f 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -81,7 +81,9 @@ static void bfin_serial_reset_irda(struct uart_port *port);
 static void bfin_serial_stop_tx(struct uart_port *port)
 {
         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+#ifdef CONFIG_SERIAL_BFIN_DMA
         struct circ_buf *xmit = &uart->port.info->xmit;
+#endif
 
         while (!(UART_GET_LSR(uart) & TEMT))
                 cpu_relax();
@@ -412,7 +414,9 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 
 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 {
-        int x_pos, pos;
+        int x_pos, pos, flags;
+
+        spin_lock_irqsave(&uart->port.lock, flags);
 
         uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
         x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
@@ -430,6 +434,8 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
                 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
         }
 
+        spin_unlock_irqrestore(&uart->port.lock, flags);
+
         mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
 }
 
@@ -464,10 +470,9 @@ static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
         spin_lock(&uart->port.lock);
         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
         clear_dma_irqstat(uart->rx_dma_channel);
+        bfin_serial_dma_rx_chars(uart);
         spin_unlock(&uart->port.lock);
 
-        mod_timer(&(uart->rx_dma_timer), jiffies);
-
         return IRQ_HANDLED;
 }
 #endif