On 11/29/2013 04:46 AM, Hiroshi Doyu wrote:
...
> Iterating over a property containing a list of phandles with arguments
> is a common operation for device drivers. This patch adds a new
> of_property_for_each_phandle_with_args() macro to make the iteration
> simpler.
>
> Introduced a new struct "of_phandle_iter" to keep the state when
> iterating over the list.
>
> Signed-off-by: Hiroshi Doyu <hdoyu@xxxxxxxxxx>
> ---
> v6+++:
Surely that's v9; "+++" is rather unusual.
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> +void of_phandle_iter_next(struct of_phandle_iter *iter,
> + struct of_phandle_args *out_args)
> +{
> + phandle phandle;
> + struct device_node *dn;
> + int i, count = iter->cell_count;
> +
> + iter->err = -EINVAL;
> + if (!iter->cells_name && !iter->cell_count)
> + return;
Wasn't that already checked in _start()?
Why not set err = -EINVAL inside the if, rather than setting it to an
error value here by default, then having to over-write it at the end of
the function?
> +static void __of_phandle_iter_set(struct of_phandle_iter *iter,
This is only used in one place; why not simply inline this into
of_phandle_iter_start()? It would make the code simpler.
> +void of_phandle_iter_start(struct of_phandle_iter *iter,
> + iter->cells_name = cells_name;
> + iter->cell_count = cell_count;
Why not pass these values into of_phandle_iter_next() instead? There's
no need to pass them just to _start() so they can be read by _next()
instead.
> diff --git a/include/linux/of.h b/include/linux/of.h
> +/*
> + * keep the state at iterating a list of phandles with variable number
> + * of args
> + */
> +struct of_phandle_iter {
> + int err;
> + const __be32 *cur; /* current phandle */
> + const __be32 *end; /* end of the last phandle */
Can't you detect an error case by e.g. (cur == NULL) and thus avoid
requiring an explicit err field?
Together with removing:
> + const char *cells_name;
> + int cell_count;
... then you'd only be left with cur/end, so I think you could get away
without a struct at all, but simply "cur" as the iterator variable, plus
"end" as the one temp variable.
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