netdev - Re: SG_IO with >4k buffer size to iscsi sg device causes "Bad page" panic

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Message-Id: <E1HlvkD-0004zY-00@gondolin.me.apana.org.au>
Date:	Thu, 10 May 2007 09:38:53 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Yanling.Qi@....com (Qi, Yanling)
Cc:	netdev@...r.kernel.org, linux-scsi@...r.kernel.org,
	open-iscsi@...glegroups.com,
	linux-iscsi-devel@...ts.sourceforge.net, Yanling.Qi@....com,
	michaelc@...wisc.edu, dougg@...que.net,
	James.Bottomley@...eleye.com
Subject: Re: SG_IO with >4k buffer size to iscsi sg device causes "Bad page" panic

Qi, Yanling <Yanling.Qi@....com> wrote:
> @@ -2571,6 +2572,13 @@ sg_page_malloc(int rqSz, int lowDma, int
>                resp = (char *) __get_free_pages(page_mask, order);
> /* try half */
>                resSz = a_size;
>        }
> +       tmppage = virt_to_page(resp);
> +       for( m = PAGE_SIZE; m < resSz; m += PAGE_SIZE )
> +       {
> +               tmppage++;
> +               SetPageReserved(tmppage);
> +       }
> +

Why not just increase the page use count?

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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