Messages in this thread |  | | Date | Thu, 23 Oct 2014 08:49:28 -0700 | From | Dmitry Torokhov <> | Subject | Re: [PATCH v3 1/5] PM / clock_ops: Add pm_clk_add_clk() |
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On Thu, Oct 23, 2014 at 05:22:58PM +0300, Grygorii Strashko wrote: > From: Geert Uytterhoeven <geert+renesas@glider.be> > > The existing pm_clk_add() allows to pass a clock by con_id. However, > when referring to a specific clock from DT, no con_id is available. > > Add pm_clk_add_clk(), which allows to specify the struct clk * directly. > > CC: Ulf Hansson <ulf.hansson@linaro.org> > CC: Dmitry Torokhov <dmitry.torokhov@gmail.com> > Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> > Reviewed-by: Kevin Hilman <khilman@linaro.org> > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> > --- > drivers/base/power/clock_ops.c | 41 +++++++++++++++++++++++++++++++---------- > include/linux/pm_clock.h | 8 ++++++++ > 2 files changed, 39 insertions(+), 10 deletions(-) > > diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c > index 7836930..f14b767 100644 > --- a/drivers/base/power/clock_ops.c > +++ b/drivers/base/power/clock_ops.c > @@ -53,7 +53,8 @@ static inline int __pm_clk_enable(struct device *dev, struct clk *clk) > */ > static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce) > { > - ce->clk = clk_get(dev, ce->con_id); > + if (!ce->clk) > + ce->clk = clk_get(dev, ce->con_id); > if (IS_ERR(ce->clk)) { > ce->status = PCE_STATUS_ERROR; > } else { > @@ -63,15 +64,8 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce) > } > } > > -/** > - * pm_clk_add - Start using a device clock for power management. > - * @dev: Device whose clock is going to be used for power management. > - * @con_id: Connection ID of the clock. > - * > - * Add the clock represented by @con_id to the list of clocks used for > - * the power management of @dev. > - */ > -int pm_clk_add(struct device *dev, const char *con_id) > +static int __pm_clk_add(struct device *dev, const char *con_id, > + struct clk *clk) > { > struct pm_subsys_data *psd = dev_to_psd(dev); > struct pm_clock_entry *ce; > @@ -93,6 +87,8 @@ int pm_clk_add(struct device *dev, const char *con_id) > kfree(ce); > return -ENOMEM; > } > + } else {
You need __clk_get(clk) here, otherwise when you will be removing clocks you'll be dropping a reference that does not belong to you (as yiou have not taken it).
> + ce->clk = clk; > } >
Thanks.
-- Dmitry
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