On Mon, Mar 02, 2015 at 11:07:58AM -0800, Stephen Boyd wrote:
> On 03/02/15 09:06, Russell King wrote:
> > Add a helper to allocate and add a clk_lookup structure. This can not
> > only be used in several places in clkdev.c to simplify the code, but
> > more importantly, can be used by callers of the clkdev code to simplify
> > their clkdev creation and registration.
> >
> > Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
> > ---
> > drivers/clk/clkdev.c | 52 ++++++++++++++++++++++++++++++++++++++------------
> > include/linux/clkdev.h | 3 +++
> > 2 files changed, 43 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
> > index 043fd3633373..611b9acbad78 100644
> > --- a/drivers/clk/clkdev.c
> > +++ b/drivers/clk/clkdev.c
> > @@ -294,6 +294,19 @@ vclkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt,
> > return &cla->cl;
> > }
> >
> > +static struct clk_lookup *
> > +vclkdev_create((struct clk *clk, const char *con_id, const char *dev_fmt,
> > + va_list ap)
> > +{
> > + struct clk_lookup *cl;
> > +
> > + cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
> > + if (cl)
> > + clkdev_add(cl);
> > +
> > + return cl;
> > +}
> > +
> > struct clk_lookup * __init_refok
> > clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
> > {
> > @@ -308,6 +321,28 @@ clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
> > }
> > EXPORT_SYMBOL(clkdev_alloc);
> >
> > +/**
> > + * clkdev_create - allocate and add a clkdev lookup structure
> > + * @clk: struct clk to associate with all clk_lookups
> > + * @con_id: connection ID string on device
> > + * @dev_fmt: format string describing device name
> > + *
> > + * Returns a clk_lookup structure, which can be later unregistered and
> > + * freed.
>
> And returns NULL on failure? Any reason why we don't return an error
> pointer on failure?
Why should it when it's only error is "no memory" ? It follows the
clkdev_alloc() and memory allocator pattern.
It'd also make the error handling in places like clk_add_alias() more
difficult (how that happened, I don't know...) though that could probably
be fixed as no one seems to bother checking the return value... maybe
that's a reason to make it return void ;)
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