linux-kernel - Re: [char-misc-next 5/5] mei: revamp read and write length checks

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Date:	Thu, 26 Sep 2013 08:22:45 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Tomas Winkler <tomas.winkler@...el.com>
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [char-misc-next 5/5] mei: revamp read and write length checks

On Mon, Sep 02, 2013 at 03:11:04AM +0300, Tomas Winkler wrote:
> 1. Return zero on zero length read and writes
> 2. For a too large write return -EFBIG as defined in man write(2)
> EFBIG  An attempt was made to write a file that
>         exceeds the implementation-defined maximum
>         file size or the process's file size limit,
>         or to  write  at  a  position  past  the  maximum
>         allowed offset.
> 
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> ---
>  drivers/misc/mei/main.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
> index 5ff810b..7404584 100644
> --- a/drivers/misc/mei/main.c
> +++ b/drivers/misc/mei/main.c
> @@ -203,12 +203,18 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
>  
>  	dev = cl->dev;
>  
> +
>  	mutex_lock(&dev->device_lock);

Not a big deal, but why the extra line?

greg k-h
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