[Blackfin] serial driver: Fix bug Free rx dma buffer in shutdown.

Kernel crash for the serial driver in DMA mode:
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3679

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Sonic Zhang 2007-12-21 17:03:39 +08:00 committed by Bryan Wu
parent 1b73351c6a
commit 75b780bd99

View file

@ -704,6 +704,7 @@ static void bfin_serial_shutdown(struct uart_port *port)
disable_dma(uart->rx_dma_channel);
free_dma(uart->rx_dma_channel);
del_timer(&(uart->rx_dma_timer));
dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
#else
#ifdef CONFIG_KGDB_UART
if (uart->port.line != CONFIG_KGDB_UART_PORT)