linux-kernel - Re: [PATCH 1/2] hwrng: manage resource allocation in amd driver

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Date:	Thu, 28 Apr 2011 14:51:53 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH 1/2] hwrng: manage resource allocation in amd driver

On Wed, 2011-04-27 at 23:21 +0400, Dmitry Eremin-Solenikov wrote:
> As amd driver doesn't bind to PCI device, we'd better manage reource
> allocation on our own to disallow (possible) conflicts.

These two look good to me.

Acked-by: Matt Mackall <mpm@...enic.com>

> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> ---
>  drivers/char/hw_random/amd-rng.c |    9 +++++++++
>  1 files changed, 9 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c
> index 0d8c578..c6af038 100644
> --- a/drivers/char/hw_random/amd-rng.c
> +++ b/drivers/char/hw_random/amd-rng.c
> @@ -133,6 +133,12 @@ found:
>  	pmbase &= 0x0000FF00;
>  	if (pmbase == 0)
>  		goto out;
> +	if (!request_region(pmbase + 0xF0, 8, "AMD HWRNG")) {
> +		dev_err(&pdev->dev, "AMD HWRNG region 0x%x already in use!\n",
> +			pmbase + 0xF0);
> +		err = -EBUSY;
> +		goto out;
> +	}
>  	amd_rng.priv = (unsigned long)pmbase;
>  	amd_pdev = pdev;
>  
> @@ -141,6 +147,7 @@ found:
>  	if (err) {
>  		printk(KERN_ERR PFX "RNG registering failed (%d)\n",
>  		       err);
> +		release_region(pmbase + 0xF0, 8);
>  		goto out;
>  	}
>  out:
> @@ -149,6 +156,8 @@ out:
>  
>  static void __exit mod_exit(void)
>  {
> +	u32 pmbase = (unsigned long)amd_rng.priv;
> +	release_region(pmbase + 0xF0, 8);
>  	hwrng_unregister(&amd_rng);
>  }
>  


-- 
Mathematics is the supreme nostalgia of our time.


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