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| author |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-06-12 17:50:00 +0300 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-06-22 10:58:52 +0300 |
| commit | e64fbfa51e8fc4eeca2d2bbf0d31a30a15734229 (patch) | |
| tree | 519b11cafe2340cb8f9bcca67e600dfd3f297478 /drivers/pinctrl/intel/pinctrl-intel.c | |
| parent | pinctrl: intel: Split intel_config_get() to three functions (diff) | |
| download | linux-dev-e64fbfa51e8fc4eeca2d2bbf0d31a30a15734229.tar.xz linux-dev-e64fbfa51e8fc4eeca2d2bbf0d31a30a15734229.zip | |
pinctrl: intel: Protect IO in few call backs by lock
Protect IO in intel_gpio_get_direction(), intel_gpio_community_irq_handler(),
intel_config_get_debounce() and intel_config_get_pull() by lock. Even for
simple readl() we better serialize IO to avoid potential problems.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/pinctrl/intel/pinctrl-intel.c')
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-intel.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c index d6ef012f2cc4..35c88fcb75a2 100644 --- a/drivers/pinctrl/intel/pinctrl-intel.c +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -526,11 +526,15 @@ static int intel_config_get_pull(struct intel_pinctrl *pctrl, unsigned int pin, { const struct intel_community *community; void __iomem *padcfg1; + unsigned long flags; u32 value, term; community = intel_get_community(pctrl, pin); padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1); + + raw_spin_lock_irqsave(&pctrl->lock, flags); value = readl(padcfg1); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT; @@ -592,6 +596,7 @@ static int intel_config_get_debounce(struct intel_pinctrl *pctrl, unsigned int p enum pin_config_param param, u32 *arg) { void __iomem *padcfg2; + unsigned long flags; unsigned long v; u32 value2; @@ -599,7 +604,9 @@ static int intel_config_get_debounce(struct intel_pinctrl *pctrl, unsigned int p if (!padcfg2) return -ENOTSUPP; + raw_spin_lock_irqsave(&pctrl->lock, flags); value2 = readl(padcfg2); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); if (!(value2 & PADCFG2_DEBEN)) return -EINVAL; @@ -934,6 +941,7 @@ static void intel_gpio_set(struct gpio_chip *chip, unsigned int offset, static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { struct intel_pinctrl *pctrl = gpiochip_get_data(chip); + unsigned long flags; void __iomem *reg; u32 padcfg0; int pin; @@ -946,8 +954,9 @@ static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) if (!reg) return -EINVAL; + raw_spin_lock_irqsave(&pctrl->lock, flags); padcfg0 = readl(reg); - + raw_spin_unlock_irqrestore(&pctrl->lock, flags); if (padcfg0 & PADCFG0_PMODE_MASK) return -EINVAL; @@ -1134,12 +1143,17 @@ static int intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl, for (gpp = 0; gpp < community->ngpps; gpp++) { const struct intel_padgroup *padgrp = &community->gpps[gpp]; unsigned long pending, enabled, gpp_offset; + unsigned long flags; + + raw_spin_lock_irqsave(&pctrl->lock, flags); pending = readl(community->regs + community->is_offset + padgrp->reg_num * 4); enabled = readl(community->regs + community->ie_offset + padgrp->reg_num * 4); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + /* Only interrupts that are enabled */ pending &= enabled; |