[PATCH] USB: serial: ch341: fix simulated-break comment

[Johan Hovold <johan@kernel.org>]

On devices which do not support break signalling a break condition is
simulated by sending a NUL byte at the lowest possible speed. The break
condition will be 9 bit periods long (start bit and eight data bits),
but the transmission itself also includes the stop bit.

Signed-off-by: Johan Hovold <johan@kernel.org>
---

Hi Michael,

I reread the break-end comment and found it a bit confusing still. The
below seems more correct to me. I'm assuming you did not intend to add
an additional bit period as margin?

Johan



 drivers/usb/serial/ch341.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 011d7953f087..27a2a62777c9 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -604,9 +604,8 @@ static void ch341_simulate_break(struct tty_struct *tty, int break_state)
 		}
 
 		/*
-		 * Compute expected transmission duration and add a single bit
-		 * of safety margin (the actual NUL byte transmission is 8 bits
-		 * plus one stop bit).
+		 * Compute expected transmission duration (including stop
+		 * bit).
 		 */
 		priv->break_end = jiffies + (10 * HZ / CH341_MIN_BPS);
 
-- 
2.26.2