linux-kernel - Re: [PATCH] libfdt: Teach fdt_path_offset() about ':' path separator

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Message-ID: <CAL_JsqKrn+PRYtG5b5QAFDG7X_hThS7YH6GaRb40F72w-QdtWg@mail.gmail.com>
Date:	Thu, 5 Mar 2015 14:48:38 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Lunn <andrew@...n.ch>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] libfdt: Teach fdt_path_offset() about ':' path separator

On Thu, Mar 5, 2015 at 11:04 AM, Peter Hurley <peter@...leysoftware.com> wrote:
> [ +cc Greg KH ]
>
> On 03/05/2015 10:23 AM, Rob Herring wrote:
>> On Wed, Mar 4, 2015 at 10:44 AM, Peter Hurley <peter@...leysoftware.com> wrote:
>>> stdout-path defines ':' as a path separator and commit 75c28c09af99a
>>> ("of: add optional options parameter to of_find_node_by_path()") added
>>> the necessary support to parse paths terminated with ':' path separator.
>>> commit 7914a7c5651a5 ("of: support passing console options with
>>> stdout-path") added options string support to the stdout-path property,
>>> which broke earlycon.
>>>
>>> Add the same support to fdt_path_offset() so earlycon can parse and
>>> process stdout-path properties containing an options string.
>>>
>>> Cc: Leif Lindholm <leif.lindholm@...aro.org>
>>> Cc: <stable@...r.kernel.org> # 3.19+
>>> Signed-off-by: Peter Hurley <peter@...leysoftware.com>
>>
>> This needs to be first applied to upstream dtc[1]. Please do a patch
>> against dtc and send to devicetree-compiler list.
>
> Sure, I can do that, but then how is this patch going to end up in
> 3.19-stable?

I'll apply it tagged for stable once it is in dtc.

Rob

>
> Regards,
> Peter Hurley
>
>> Rob
>>
>> [1] https://git.kernel.org/cgit/linux/kernel/git/jdl/dtc.git/
>>
>>> ---
>>>  scripts/dtc/libfdt/fdt_ro.c | 9 +++++----
>>>  1 file changed, 5 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/scripts/dtc/libfdt/fdt_ro.c b/scripts/dtc/libfdt/fdt_ro.c
>>> index 02b6d68..a96e452 100644
>>> --- a/scripts/dtc/libfdt/fdt_ro.c
>>> +++ b/scripts/dtc/libfdt/fdt_ro.c
>>> @@ -156,7 +156,8 @@ int fdt_subnode_offset(const void *fdt, int parentoffset,
>>>
>>>  int fdt_path_offset(const void *fdt, const char *path)
>>>  {
>>> -       const char *end = path + strlen(path);
>>> +       const char *separator = strchr(path, ':');
>>> +       const char *end = separator ? separator : path + strlen(path);
>>>         const char *p = path;
>>>         int offset = 0;
>>>
>>> @@ -166,7 +167,7 @@ int fdt_path_offset(const void *fdt, const char *path)
>>>         if (*path != '/') {
>>>                 const char *q = strchr(path, '/');
>>>
>>> -               if (!q)
>>> +               if (!q || q > end)
>>>                         q = end;
>>>
>>>                 p = fdt_get_alias_namelen(fdt, p, q - p);
>>> @@ -177,7 +178,7 @@ int fdt_path_offset(const void *fdt, const char *path)
>>>                 p = q;
>>>         }
>>>
>>> -       while (*p) {
>>> +       while (p < end) {
>>>                 const char *q;
>>>
>>>                 while (*p == '/')
>>> @@ -185,7 +186,7 @@ int fdt_path_offset(const void *fdt, const char *path)
>>>                 if (! *p)
>>>                         return offset;
>>>                 q = strchr(p, '/');
>>> -               if (! q)
>>> +               if (!q || q > end)
>>>                         q = end;
>>>
>>>                 offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
>>> --
>>> 2.3.1
>>>
>
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