From: David Vrabel <david.vrabel@citrix.com>
To: Ian Campbell <ian.campbell@citrix.com>
Cc: xen-devel@lists.xen.org
Subject: Re: [PATCH 4/8] device-tree: get_val cannot cope with cells > 2, add early_panic
Date: Thu, 6 Dec 2012 12:13:05 +0000 [thread overview]
Message-ID: <50C08BD1.50905@citrix.com> (raw)
In-Reply-To: <1354554631-17861-4-git-send-email-ian.campbell@citrix.com>
On 03/12/12 17:10, Ian Campbell wrote:
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
> ---
> v3: early_panic instead of BUG_ON
> v2: drop unrelated white space fixup
> ---
> xen/common/device_tree.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index 9eb316f..5a0a1a6 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -58,6 +58,9 @@ static void __init get_val(const u32 **cell, u32 cells, u64 *val)
> {
> *val = 0;
>
> + if ( cells > 2 )
> + early_panic("dtb value contains > 2 cells\n");
> +
This seems like overkill to me. get_val() truncates the value down to
64 bits which is fine as no valid physical address is more than 64 bits.
I think the device tree parsing code should try to continue as much as
possible if it gets a DTB that looks a bit funny.
David
next prev parent reply other threads:[~2012-12-06 12:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-03 17:10 [PATCH 00/08 V2] arm: support for initial modules (e.g. dom0) and DTB supplied in RAM Ian Campbell
2012-12-03 17:10 ` [PATCH 1/8] arm: parse modules from DT during early boot Ian Campbell
2012-12-03 17:10 ` [PATCH 2/8] arm: avoid placing Xen over any modules Ian Campbell
2012-12-03 17:10 ` [PATCH 3/8] arm: avoid allocating the heaps over modules or xen itself Ian Campbell
2012-12-03 17:10 ` [PATCH 4/8] device-tree: get_val cannot cope with cells > 2, add early_panic Ian Campbell
2012-12-06 11:56 ` Tim Deegan
2012-12-06 12:13 ` David Vrabel [this message]
2012-12-06 13:00 ` Ian Campbell
2012-12-03 17:10 ` [PATCH 5/8] arm: load dom0 kernel from first boot module Ian Campbell
2012-12-06 12:03 ` Tim Deegan
2012-12-03 17:10 ` [PATCH 6/8] arm: discard boot modules after building domain 0 Ian Campbell
2012-12-03 17:10 ` [PATCH 7/8] arm: use /chosen/module@1/bootargs for domain 0 command line Ian Campbell
2012-12-03 17:10 ` [PATCH 8/8] xen: strip /chosen/module@<N>/* from dom0 device tree Ian Campbell
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