linux-kernel - Re: [PATCH] tty: hold lock across tty buffer finding and buffer filling

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Date:	Thu, 15 Mar 2012 13:26:33 -0700
From:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:	"Tu, Xiaobing" <xiaobing.tu@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	"Du, Alek" <alek.du@...el.com>, "Zuo, Jiao" <jiao.zuo@...el.com>
Subject: Re: [PATCH] tty: hold lock across tty buffer finding and buffer
 filling

On Thu, Mar 15, 2012 at 02:06:43AM +0000, Tu, Xiaobing wrote:
> From: Xiaobing Tu <xiaobing.tu@...el.com>
> 
> tty_buffer_request_room is well protected, but while after it returns,
>  it releases the port->lock. tty->buf.tail might be modified
> by either irq handler or other threads. The patch adds more protection
> by holding the lock across tty buffer finding and buffer filling.
> 
> Signed-off-by: Alek Du <alek.du@...el.com>
> Signed-off-by: Xiaobing Tu <xiaobing.tu@...el.com>
> ---
>  drivers/tty/tty_buffer.c |   85 +++++++++++++++++++++++++++++++++++-----------
>  1 files changed, 65 insertions(+), 20 deletions(-)
>  mode change 100644 => 100755 drivers/tty/tty_buffer.c
> 
> diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
> old mode 100644
> new mode 100755

What?  Why would you change the mode of the file to be executable?

Also, your patch introduces a bunch of trailing whitespace, please run
it through scripts/checkpatch.pl and fix those issues before resending
it.

thanks,

greg k-h
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