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SubjectRe: [PATCH] sysfs: add /sys/dev/{char, block} to lookup sysfs path by major:minor
On Mon, Apr 14, 2008 at 8:13 PM, SL Baur <steve@xemacs.org> wrote:
> On 4/14/08, Dan Williams <dan.j.williams@intel.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.
>

Thanks for looking it over. To be honest I was iffy about those
buffer sizes as well, and looking closer they are overkill. Although,
they are smaller than the 32-byte buffer in bsg.c :-). 13-bytes is all
that is needed given a 12-bit major and 20-bit minor. Care to send a
patch to fix up format_dev_t and print_dev_t?

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

Yes, appropriate.

Thanks,
Dan


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