linux-kernel - Re: [000/136] 2.6.31.2-stable review

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Date:	Thu, 01 Oct 2009 23:06:11 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Subject: Re: [000/136] 2.6.31.2-stable review

Greg KH <gregkh@...e.de> writes:

> On Thu, Oct 01, 2009 at 10:01:34PM -0700, Eric W. Biederman wrote:
>> Greg KH <gregkh@...e.de> writes:
>> 
>> > Note from the -stable maintainer on this release:
>> >
>> >   This release is big.  Yeah, really big.  There are a number of
>> >   areas that needed some rework in order to get things back to
>> >   working order.  Like the tty layer.  Hopefully everyone can now
>> >   use their usb to serial devices again without oopsing the
>> >   kernel
>> 
>> The ftdi_sio driver still crashes and burns.
>
> What were you doing when it crashed?  I tested the pl2303 device and it
> worked fine for me here, I don't have a ftdi_sio one :(

The patch that floated on the list earlier does fix the worst of the
symptoms.

Eric

From: Johan Hovold <jhovold@...il.com>
Subject: [PATCH] USB: ftdi_sio: Remove tty->low_latency.

Fixes tty_flip_buffer_push being called from hard interrupt context with
low_latency set.

Signed-off-by: Johan Hovold <jhovold@...il.com>
---
 drivers/usb/serial/ftdi_sio.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 8fec5d4..22b72e8 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1228,7 +1228,6 @@ static int set_serial_info(struct tty_struct *tty,
 					(new_serial.flags & ASYNC_FLAGS));
 	priv->custom_divisor = new_serial.custom_divisor;
 
-	tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 	write_latency_timer(port);
 
 check_and_exit:
@@ -1699,9 +1698,6 @@ static int ftdi_open(struct tty_struct *tty,
 	priv->rx_bytes = 0;
 	spin_unlock_irqrestore(&priv->rx_lock, flags);
 
-	if (tty)
-		tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
-
 	write_latency_timer(port);
 
 	/* No error checking for this (will get errors later anyway) */
-- 
1.6.2.5
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