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authorGrace Kao <grace.kao@intel.com>2020-04-17 07:11:54 +0300
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>2020-04-17 14:36:22 +0300
commit3dbf1ee6abbb30d21db0649b93a34576da64ab00 (patch)
tree41ddf6ee81d50274e490aa5afba54f242a60d348 /drivers/pinctrl/intel
parent5f3b82a168d597099dfc20e47e9389c1f7d0c11b (diff)
downloadlinux-3dbf1ee6abbb30d21db0649b93a34576da64ab00.tar.xz
pinctrl: cherryview: Add missing spinlock usage in chv_gpio_irq_handler
According to Braswell NDA Specification Update (#557593), concurrent read accesses may result in returning 0xffffffff and write instructions may be dropped. We have an established format for the commit references, i.e. cdca06e4e859 ("pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler") Fixes: 0bd50d719b00 ("pinctrl: cherryview: prevent concurrent access to GPIO controllers") Signed-off-by: Grace Kao <grace.kao@intel.com> Reported-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Brian Norris <briannorris@chromium.org> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/pinctrl/intel')
-rw-r--r--drivers/pinctrl/intel/pinctrl-cherryview.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-cherryview.c b/drivers/pinctrl/intel/pinctrl-cherryview.c
index 53f2775f7184..8e3953a223d0 100644
--- a/drivers/pinctrl/intel/pinctrl-cherryview.c
+++ b/drivers/pinctrl/intel/pinctrl-cherryview.c
@@ -1411,11 +1411,15 @@ static void chv_gpio_irq_handler(struct irq_desc *desc)
struct chv_pinctrl *pctrl = gpiochip_get_data(gc);
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned long pending;
+ unsigned long flags;
u32 intr_line;
chained_irq_enter(chip, desc);
+ raw_spin_lock_irqsave(&chv_lock, flags);
pending = readl(pctrl->regs + CHV_INTSTAT);
+ raw_spin_unlock_irqrestore(&chv_lock, flags);
+
for_each_set_bit(intr_line, &pending, pctrl->community->nirqs) {
unsigned int irq, offset;