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pch_uart: fix exclusive access issue

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Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tomoya MORINAGA 2011-02-23 10:03:18 +09:00 committed by Greg Kroah-Hartman
parent 9af7155bb0
commit 60d1031e11
1 changed files with 9 additions and 2 deletions
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11
drivers/tty/serial/pch_uart.c
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@ -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)) {