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usb: serial: mos7840: Fixup mos7840_chars_in_buffer()

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* 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>
This commit is contained in:
Mark Ferrell 2012-07-24 14:15:13 -05:00 committed by Greg Kroah-Hartman
parent 4840ae17ba
commit 5c263b92f8
1 changed files with 6 additions and 3 deletions
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9
drivers/usb/serial/mos7840.c
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@ -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;