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SubjectRe: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi_loader to hang
Date
Am Montag, 18. Januar 2010 02:58:44 schrieb Matthew Garrett:
> drivers/usb/serial/generic.c: usb_serial_generic_write - port 0
> drivers/usb/serial/usb-serial.c: serial_write - port 0, 1536 byte(s)
> drivers/usb/serial/generic.c: usb_serial_generic_write - port 0
> drivers/usb/serial/usb-serial.c: usb_serial_port_work - port 0
> drivers/usb/serial/usb-serial.c: serial_write - port 0, 1536 byte(s)
> drivers/usb/serial/generic.c: usb_serial_generic_write - port 0

Hi,

it is not conclusive. Can you apply the attached patch and try again?

Regards
Oliver
From 27e54a5d36aba23276d30bd61b962916dca7a946 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oliver@neukum.org>
Date: Mon, 18 Jan 2010 18:23:09 +0100
Subject: [PATCH] additional debugging

---
drivers/usb/serial/generic.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index f1ea3a3..76e5514 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -283,6 +283,8 @@ static int usb_serial_generic_write_start(struct usb_serial_port *port)

if (!start_io)
return 0;
+
+ dbg("%s - starting IO", __func__);

data = port->write_urb->transfer_buffer;
count = kfifo_out_locked(&port->write_fifo, data, port->bulk_out_size, &port->lock);
@@ -330,7 +332,7 @@ int usb_serial_generic_write(struct tty_struct *tty,
struct usb_serial *serial = port->serial;
int result;

- dbg("%s - port %d", __func__, port->number);
+ dbg("%s - port %d, %d bytes", __func__, port->number, count);

if (count == 0) {
dbg("%s - write request of 0 bytes", __func__);
@@ -346,6 +348,7 @@ int usb_serial_generic_write(struct tty_struct *tty,
buf, count);

count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
+ dbg("%s - put %d bytes into fifo", __func__, count);
result = usb_serial_generic_write_start(port);

if (result >= 0)
--
1.6.4.2
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