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iio: pressure: bmp280: Tolerate IRQ before registering

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[ Upstream commit 97b31a6f5fb95b1ec6575b78a7240baddba34384 ]

With DEBUG_SHIRQ enabled we have a kernel crash

[  116.482696] BUG: kernel NULL pointer dereference, address: 0000000000000000

...

[  116.606571] Call Trace:
[  116.609023]  <IRQ>
[  116.611047]  complete+0x34/0x50
[  116.614206]  bmp085_eoc_irq+0x9/0x10 [bmp280]

because DEBUG_SHIRQ mechanism fires an IRQ before registration and drivers
ought to be able to handle an interrupt happening before request_irq() returns.

Fixes: aae9539496 ("iio: pressure: bmp280: add support for BMP085 EOC interrupt")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andy Shevchenko 2020-03-23 12:41:25 +02:00 • committed by Greg Kroah-Hartman
commit 8bd207bb1a
1 changed files with 4 additions and 1 deletions
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5
drivers/iio/pressure/bmp280-core.c
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@ -706,7 +706,7 @@ static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
unsigned int ctrl;
if (data->use_eoc)
init_completion(&data->done);
reinit_completion(&data->done);
ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas);
if (ret)
@ -962,6 +962,9 @@ static int bmp085_fetch_eoc_irq(struct device *dev,
"trying to enforce it\n");
irq_trig = IRQF_TRIGGER_RISING;
}
init_completion(&data->done);
ret = devm_request_threaded_irq(dev,
irq,
bmp085_eoc_irq,