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authorSonic Zhang <sonic.zhang@analog.com>2009-04-06 20:32:42 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 01:36:29 +0400
commit8c4210e3362e1cd44bd10c857dc5f69c0bf434da (patch)
tree0c7b16f6c9edd95be24329b415a861cbfdbfe8b0 /drivers/serial/bfin_5xx.c
parentdf04baf1e6a62ff232fa224504ccaa987b5be230 (diff)
downloadlinux-8c4210e3362e1cd44bd10c857dc5f69c0bf434da.tar.xz
Fix DMA rx ring buffer handling
Reported-by: Qian Zhang <zhangq@sansitech.com> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/serial/bfin_5xx.c')
-rw-r--r--drivers/serial/bfin_5xx.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index d7b271656a2d..12b11da40b49 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -401,9 +401,11 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
else
flg = TTY_NORMAL;
- for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
+ for (i = uart->rx_dma_buf.tail; ; i++) {
if (i >= UART_XMIT_SIZE)
i = 0;
+ if (i == uart->rx_dma_buf.head)
+ break;
if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
uart_insert_char(&uart->port, status, OE,
uart->rx_dma_buf.buf[i], flg);