Alan Cox wrote:
Try adding this patch as well. It fixes a general bug in the tty_port
code that might be related. You'll need both patches if so
Ok with both patches everything works as before 9a68e39d4a From
(2.6.15 <= kernels <= 2.6.30.x)
tty_port: If we are opened non blocking we still need to raise the carrier
From: Alan Cox <alan@xxxxxxxxxxxxxxx>
The tty_port code inherited a bug common to various drivers it was based
upon. If the tty is opened O_NONBLOCK we do not wait for the carrier to be
raised but we must still raise our modem lines if appropriate.
(There is a second question here about whether we should do so if CLOCAL is
set but that can wait)
I'm wondering, if this bug only occurs on the cp210x driver/hardware
why not just fix it in the cp210x_open() ?
If it occurs in other drivers then yes, its best to avoid the
duplicated code.
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
Reported-by: Karl Hiramoto <karl@xxxxxxxxxxxx>
Tested-by: Karl Hiramoto <karl@xxxxxxxxxxxx>
---
drivers/char/tty_port.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 8e85657..ed05d2a 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -243,6 +243,9 @@ int tty_port_block_til_ready(struct tty_port *port,
the port has just hung up or is in another error state */
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
+ /* Indicate we are open */
+ if (tty->termios->c_cflag & CBAUD)
+ tty_port_raise_dtr_rts(port);
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
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