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authorTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>2011-02-23 10:03:18 +0900
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-22 17:22:04 -0800
commit60d1031e114a3e96e4420421e34ddc0dcd10cbae (patch)
treedec57b1c70ea18ba6f1eda148fb206fe59203155 /drivers/tty
parent9af7155bb03675ba2d4d68428a4345e0511ce8dd (diff)
pch_uart: fix exclusive access issue
Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/pch_uart.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 0c95051fa0a..da0ba0fa2b9 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -636,8 +636,7 @@ static void pch_dma_tx_complete(void *arg)
priv->tx_dma_use = 0;
priv->nent = 0;
kfree(priv->sg_tx_p);
- if (uart_circ_chars_pending(xmit))
- pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
+ pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
}
static int pop_tx(struct eg20t_port *priv, int size)
@@ -793,6 +792,14 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
return 0;
}
+ if (priv->tx_dma_use) {
+ dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
+ __func__, jiffies);
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+ priv->tx_empty = 1;
+ return 0;
+ }
+
fifo_size = max(priv->fifo_size, 1);
tx_empty = 1;
if (pop_tx_x(priv, xmit->buf)) {