linux-kernel - Re: [PATCH] sysfs: add /sys/dev/{char, block} to lookup sysfs path by major:minor

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Date:	Mon, 14 Apr 2008 20:13:40 -0700
From:	"SL Baur" <steve@...acs.org>
To:	"Dan Williams" <dan.j.williams@...el.com>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org, kay.sievers@...y.org,
	neilb@...e.de, htejun@...il.com, hpa@...or.com, lkml@....ca
Subject: Re: [PATCH] sysfs: add /sys/dev/{char, block} to lookup sysfs path by major:minor

On 4/14/08, Dan Williams <dan.j.williams@...el.com> wrote:

>  This is the second revision of the patch originally posted here:
>  http://marc.info/?l=linux-kernel&m=120795638915272&w=2
>
>  * Fixed up ENOMEM handling in devices_init()
>  * Added a short blurb in Documentation/filesystems/sysfs.txt
>
>   Documentation/filesystems/sysfs.txt |    6 +++++
>   drivers/base/core.c                 |   46 ++++++++++++++++++++++++++++++++++-
>   2 files changed, 51 insertions(+), 1 deletions(-)

I've looked this patch over and I have some comments.  The logic looks
correct, but there are two ugly lines.

>  @@ -775,6 +783,7 @@ int device_add(struct device *dev)
>         struct device *parent = NULL;
>         struct class_interface *class_intf;
>         int error;
>  +       char devt_str[25];

>  @@ -925,12 +944,16 @@ void device_del(struct device *dev)
>   {
>         struct device *parent = dev->parent;
>         struct class_interface *class_intf;
>  +       char devt_str[25];

May I ask why `25'?  The only other user of format_dev_t that I could find
in a quick grep is md (device-mapper) and they used a hardcoded `15' there.
The real problem is format_dev_t and print_dev_t.

If the only other user of those macros which want to be C inlines with
buffer size parameters is md, perhaps now would be a good time to clean
them up before adding more users?

Otherwise, the logic looks O.K.

Add my
Reviewed-by: SL Baur <steve@...acs.org>
if that is appropriate.

-sb
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