linux-kernel - Re: [PATCH 01/18] char: moxa: call disable_pci_device() if pci

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Date:	Sat, 7 Aug 2010 09:22:05 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Kulikov Vasiliy <segooon@...il.com>
Cc:	kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rakib Mullick <rakib.mullick@...il.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/18] char: moxa: call disable_pci_device() if
	pci_probe() failed

On Fri, Aug 06, 2010 at 11:49:10PM +0400, Kulikov Vasiliy wrote:
> Driver should call disable_pci_device() if it returns from pci_probe()
> with error. Also it must not be called if pci_request_region() fails as
> it means that somebody uses device resources and rules the device.
> 

I think we should disable it actually.  The comments on
pci_enable_device() and pci_disable_device() say that only the first and
last callers actually enable and disable it.  The others just increment
or decrement a counter.

regards,
dan carpenter

> Move pci_enable_device() after checking moxa_boards[] to remove senseless
> pci_enable_device()/pci_disable_device().
> 
> Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
> ---
>  drivers/char/moxa.c |   12 +++++++-----
>  1 files changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
> index 107b0bd..0ea5aeb 100644
> --- a/drivers/char/moxa.c
> +++ b/drivers/char/moxa.c
> @@ -939,11 +939,6 @@ static int __devinit moxa_pci_probe(struct pci_dev *pdev,
>  	int board_type = ent->driver_data;
>  	int retval;
>  
> -	retval = pci_enable_device(pdev);
> -	if (retval) {
> -		dev_err(&pdev->dev, "can't enable pci device\n");
> -		goto err;
> -	}
>  
>  	for (i = 0; i < MAX_BOARDS; i++)
>  		if (moxa_boards[i].basemem == NULL)
> @@ -956,6 +951,12 @@ static int __devinit moxa_pci_probe(struct pci_dev *pdev,
>  		goto err;
>  	}
>  
> +	retval = pci_enable_device(pdev);
> +	if (retval) {
> +		dev_err(&pdev->dev, "can't enable pci device\n");
> +		goto err;
> +	}
> +
>  	board = &moxa_boards[i];
>  
>  	retval = pci_request_region(pdev, 2, "moxa-base");
> @@ -1001,6 +1002,7 @@ err_base:
>  	board->basemem = NULL;
>  err_reg:
>  	pci_release_region(pdev, 2);
> +	pci_disable_device(pdev);
>  err:
>  	return retval;
>  }
> -- 
> 1.7.0.4
> 
> --
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