From: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
Caller functions of __dma_rx_do_complete() already hold rx_dma_lock.
Therefore move locking out of the function to avoid need to release and
reacquire lock.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
Signed-off-by: Vignesh Raghavendra <vigneshr@xxxxxx>
---
drivers/tty/serial/8250/8250_omap.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index be2b7d374e60..aef0535b62a4 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -736,22 +736,19 @@ static void omap_8250_unthrottle(struct uart_port *port)
#ifdef CONFIG_SERIAL_8250_DMA
static int omap_8250_rx_dma(struct uart_8250_port *p);
+/* Must be called while priv->rx_dma_lock is held */
static void __dma_rx_do_complete(struct uart_8250_port *p)
{
- struct omap8250_priv *priv = p->port.private_data;
struct uart_8250_dma *dma = p->dma;
struct tty_port *tty_port = &p->port.state->port;
struct dma_chan *rxchan = dma->rxchan;
dma_cookie_t cookie;
struct dma_tx_state state;
int count;
- unsigned long flags;
int ret;
- spin_lock_irqsave(&priv->rx_dma_lock, flags);
-
if (!dma->rx_running)
- goto unlock;
+ goto out;
cookie = dma->rx_cookie;
dma->rx_running = 0;
@@ -777,13 +774,12 @@ static void __dma_rx_do_complete(struct uart_8250_port *p)
}
}
if (!count)
- goto unlock;
+ goto out;
ret = tty_insert_flip_string(tty_port, dma->rx_buf, count);
p->port.icount.rx += ret;
p->port.icount.buf_overrun += count - ret;
-unlock:
- spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
+out:
tty_flip_buffer_push(tty_port);
}
@@ -836,9 +832,8 @@ static void omap_8250_rx_dma_flush(struct uart_8250_port *p)
if (WARN_ON_ONCE(ret))
priv->rx_dma_broken = true;
}
- spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
-
__dma_rx_do_complete(p);
+ spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
}
static int omap_8250_rx_dma(struct uart_8250_port *p)
--
2.25.2
