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SubjectRe: [PATCH v2 2/4] pinctrl: rockchip: convert to raw spinlock
On Wed, 15 Mar 2017 13:01:37 -0500, Julia Cartwright wrote:
> On Wed, Mar 15, 2017 at 05:46:52PM +0000, John Keeping wrote:
> > This lock is used from rockchip_irq_set_type() which is part of the
> > irq_chip implementation and thus must use raw_spinlock_t as documented
> > in Documentation/gpio/driver.txt.
> >
> > Signed-off-by: John Keeping <john@metanate.com>
> > Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> > Tested-by: Heiko Stuebner <heiko@sntech.de>
> > ---
> > v2: unchanged
> > ---
> > drivers/pinctrl/pinctrl-rockchip.c | 30 +++++++++++++++---------------
> > 1 file changed, 15 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
> > index 128c383ea7ba..8c1cae6d78d7 100644
> > --- a/drivers/pinctrl/pinctrl-rockchip.c
> > +++ b/drivers/pinctrl/pinctrl-rockchip.c
> > @@ -163,7 +163,7 @@ struct rockchip_pin_bank {
> > struct irq_domain *domain;
> > struct gpio_chip gpio_chip;
> > struct pinctrl_gpio_range grange;
> > - spinlock_t slock;
> > + raw_spinlock_t slock;
> > u32 toggle_edge_mode;
> > };
> >
> > @@ -1295,14 +1295,14 @@ static int rockchip_set_pull(struct rockchip_pin_bank *bank,
> >
> > switch (ctrl->type) {
> > case RK2928:
> > - spin_lock_irqsave(&bank->slock, flags);
> > + raw_spin_lock_irqsave(&bank->slock, flags);
> >
> > data = BIT(bit + 16);
> > if (pull == PIN_CONFIG_BIAS_DISABLE)
> > data |= BIT(bit);
>
> This should be lifted out from under the lock.
>
> > ret = regmap_write(regmap, reg, data);
>
> How is this legal? The regmap_write() here is going to end up acquiring
> the regmap mutex.

It's not, the spinlock can be deleted here. I only have RK3288 hardware
to test and I missed this when checking the uses of slock.


John

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