diff options
| author | Grace Kao <grace.kao@intel.com> | 2020-04-17 07:11:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-20 09:15:35 +0300 |
| commit | e965c55d4ef594ff2426d204fbd58da0285be8db (patch) | |
| tree | 7852a124dca5e7e3f53a37432ab0d9b69a0c3c21 | |
| parent | 27634d8333a74aaf904a89575eac05503dbaf497 (diff) | |
| download | linux-e965c55d4ef594ff2426d204fbd58da0285be8db.tar.xz | |
pinctrl: cherryview: Add missing spinlock usage in chv_gpio_irq_handler
[ Upstream commit 69388e15f5078c961b9e5319e22baea4c57deff1 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-cherryview.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-cherryview.c b/drivers/pinctrl/intel/pinctrl-cherryview.c index e8c08eb97530..d1a99b2e2d4c 100644 --- a/drivers/pinctrl/intel/pinctrl-cherryview.c +++ b/drivers/pinctrl/intel/pinctrl-cherryview.c @@ -1509,11 +1509,15 @@ 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 irq, offset; |