diff options
| author | Sonic Zhang <sonic.zhang@analog.com> | 2009-04-06 17:32:42 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-06 14:36:29 -0700 |
| commit | 8c4210e3362e1cd44bd10c857dc5f69c0bf434da (patch) | |
| tree | 0c7b16f6c9edd95be24329b415a861cbfdbfe8b0 /drivers/serial/bfin_5xx.c | |
| parent | df04baf1e6a62ff232fa224504ccaa987b5be230 (diff) | |
| download | lwn-8c4210e3362e1cd44bd10c857dc5f69c0bf434da.tar.gz lwn-8c4210e3362e1cd44bd10c857dc5f69c0bf434da.zip | |
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.c | 4 |
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); |