Am Montag, 18. Januar 2010 21:14:16 schrieb Matthew Garrett:
> drivers/usb/serial/generic.c: usb_serial_generic_write - port 0, 1565
> bytes
> drivers/usb/serial/generic.c: usb_serial_generic_write - put 0 bytes
> into fifo
> drivers/usb/serial/generic.c: usb_serial_generic_read_bulk_callback -
> port 0
If the FIFO is full we can do nothing. Please try the attached patch.
Regards
Oliver
From d7317bae0772b794a1cc9b832bc3d3e1b3642a13 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oliver@xxxxxxxxxx>
Date: Tue, 19 Jan 2010 14:16:41 +0100
Subject: [PATCH] usb:serial:Deal with filled FIFO
Bail out if the FIFO is filled
Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>
---
drivers/usb/serial/generic.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 76e5514..053f7f1 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -349,6 +349,10 @@ int usb_serial_generic_write(struct tty_struct *tty,
count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
dbg("%s - put %d bytes into fifo", __func__, count);
+ if (!count) {
+ dbg("%s - FIFO is full", __func__);
+ return 0;
+ }
result = usb_serial_generic_write_start(port);
if (result >= 0)
--
1.6.4.2
