linux-kernel - Re: [PATCH] agp: fix scratch page cleanup

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Message-ID: <alpine.DEB.2.00.1201251900330.12477@skynet.skynet.ie>
Date:	Wed, 25 Jan 2012 19:01:35 +0000 (GMT)
From:	Dave Airlie <airlied@...ux.ie>
To:	Michal Kubecek <mkubecek@...e.cz>, JBeulich@...e.com
cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] agp: fix scratch page cleanup


> In error cleanup of agp_backend_initialize() and in agp_backend_cleanup(),
> agp_destroy_page() is passed virtual address of the scratch page. This
> leads to a kernel warning if the initialization fails (or upon regular
> cleanup) as pointer to struct page should be passed instead.

Jan can you check and ack this if okay? since you wrote this chunk 
originally?

Dave.

> 
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
> ---
>  drivers/char/agp/backend.c |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
> index 4b71647..317c28c 100644
> --- a/drivers/char/agp/backend.c
> +++ b/drivers/char/agp/backend.c
> @@ -194,10 +194,10 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
>  
>  err_out:
>  	if (bridge->driver->needs_scratch_page) {
> -		void *va = page_address(bridge->scratch_page_page);
> +		struct page *page = bridge->scratch_page_page;
>  
> -		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
> -		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
> +		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
> +		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
>  	}
>  	if (got_gatt)
>  		bridge->driver->free_gatt_table(bridge);
> @@ -221,10 +221,10 @@ static void agp_backend_cleanup(struct agp_bridge_data *bridge)
>  
>  	if (bridge->driver->agp_destroy_page &&
>  	    bridge->driver->needs_scratch_page) {
> -		void *va = page_address(bridge->scratch_page_page);
> +		struct page *page = bridge->scratch_page_page;
>  
> -		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
> -		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
> +		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
> +		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
>  	}
>  }
>  
> 
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