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serial: 8250: 8250_omap: Move locking out from __dma_rx_do_complete()

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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@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20200319110344.21348-4-vigneshr@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Ujfalusi 2020-03-19 16:33:41 +05:30 committed by Greg Kroah-Hartman
parent 4bcf59a5de
commit 7898984167
1 changed files with 5 additions and 10 deletions
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15
drivers/tty/serial/8250/8250_omap.c
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@ -736,22 +736,19 @@ static void omap_8250_unthrottle(struct uart_port *port)
#ifdef CONFIG_SERIAL_8250_DMA #ifdef CONFIG_SERIAL_8250_DMA
static int omap_8250_rx_dma(struct uart_8250_port *p); 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) 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 uart_8250_dma *dma = p->dma;
struct tty_port *tty_port = &p->port.state->port; struct tty_port *tty_port = &p->port.state->port;
struct dma_chan *rxchan = dma->rxchan; struct dma_chan *rxchan = dma->rxchan;
dma_cookie_t cookie; dma_cookie_t cookie;
struct dma_tx_state state; struct dma_tx_state state;
int count; int count;
unsigned long flags;
int ret; int ret;
spin_lock_irqsave(&priv->rx_dma_lock, flags);
if (!dma->rx_running) if (!dma->rx_running)
goto unlock; goto out;
cookie = dma->rx_cookie; cookie = dma->rx_cookie;
dma->rx_running = 0; dma->rx_running = 0;
@ -777,13 +774,12 @@ static void __dma_rx_do_complete(struct uart_8250_port *p)
} }
} }
if (!count) if (!count)
goto unlock; goto out;
ret = tty_insert_flip_string(tty_port, dma->rx_buf, count); ret = tty_insert_flip_string(tty_port, dma->rx_buf, count);
p->port.icount.rx += ret; p->port.icount.rx += ret;
p->port.icount.buf_overrun += count - ret; p->port.icount.buf_overrun += count - ret;
unlock: out:
spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
tty_flip_buffer_push(tty_port); 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)) if (WARN_ON_ONCE(ret))
priv->rx_dma_broken = true; priv->rx_dma_broken = true;
} }
spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
__dma_rx_do_complete(p); __dma_rx_do_complete(p);
spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
} }
static int omap_8250_rx_dma(struct uart_8250_port *p) static int omap_8250_rx_dma(struct uart_8250_port *p)