From: Mark Ferrell <mferrell@uplogix.com>
Date: Tue, 24 Jul 2012 19:15:13 +0000 (-0500)
Subject: usb: serial: mos7840: Fixup mos7840_chars_in_buffer()
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=5c263b92f828af6a8cf54041db45ceae5af8f2ab;p=deliverable%2Flinux.git

usb: serial: mos7840: Fixup mos7840_chars_in_buffer()

 * Use the buffer content length as opposed to the total buffer size.  This can
   be a real problem when using the mos7840 as a usb serial-console as all
   kernel output is truncated during boot.

Signed-off-by: Mark Ferrell <mferrell@uplogix.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 57eca2448424..009c1d99e146 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1232,9 +1232,12 @@ static int mos7840_chars_in_buffer(struct tty_struct *tty)
 		return 0;
 
 	spin_lock_irqsave(&mos7840_port->pool_lock, flags);
-	for (i = 0; i < NUM_URBS; ++i)
-		if (mos7840_port->busy[i])
-			chars += URB_TRANSFER_BUFFER_SIZE;
+	for (i = 0; i < NUM_URBS; ++i) {
+		if (mos7840_port->busy[i]) {
+			struct urb *urb = mos7840_port->write_urb_pool[i];
+			chars += urb->transfer_buffer_length;
+		}
+	}
 	spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
 	dbg("%s - returns %d", __func__, chars);
 	return chars;