linux-kernel - Re: mtip32xx: Add new bitwise flag 'dd

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Date:	Mon, 16 Apr 2012 12:21:53 -0700
From:	Asai Thambi S P <asamymuthupa@...ron.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Jens Axboe <axboe@...nel.dk>, <linux-kernel@...r.kernel.org>
Subject: Re: mtip32xx: Add new bitwise flag 'dd_flag'

On 4/16/2012 4:12 AM, Dan Carpenter wrote:

> Hello Asai Thambi S P,
> 
> The patch 45038367c271: "mtip32xx: Add new bitwise flag 'dd_flag'"
> from Apr 9, 2012, leads to the following Smatch warning:
> drivers/block/mtip32xx/mtip32xx.c:2516 mtip_hw_get_scatterlist()
> 	 warn: inconsistent returns sem:&dd->port->cmd_slot: locked (2514,2516) unlocked ()
> 
> @@ -2193,6 +2245,10 @@ static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
>         down(&dd->port->cmd_slot);
>         *tag = get_slot(dd->port);
>  
> +       if (unlikely(test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag))) {
> +               up(&dd->port->cmd_slot);
>                 ^^^^^^^^^^^^^^^^^^^^^^^
> We release the lock here.
> 
> +               return NULL;
> +       }
>         if (unlikely(*tag < 0))
>                 return NULL;
>                 ^^^^^^^^^^^^
> Should we release it here as well?
> 

Thanks for finding this. I should start using smatch :). I will send out the
patch.

--
Regards,
Asai Thambi

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