6.1-stable review patch. If anyone has any objections, please let me know.
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From: Marcelo Schmitt marcelo.schmitt@analog.com
commit a25a7df518fc71b1ba981d691e9322e645d2689c upstream.
Previous version of ad7091r event handler received the ADC state pointer and retrieved the iio device from driver data field with dev_get_drvdata(). However, no driver data have ever been set, which led to null pointer dereference when running the event handler.
Pass the iio device to the event handler and retrieve the ADC state struct from it so we avoid the null pointer dereference and save the driver from filling the driver data field.
Fixes: ca69300173b6 ("iio: adc: Add support for AD7091R5 ADC") Signed-off-by: Marcelo Schmitt marcelo.schmitt@analog.com Link: https://lore.kernel.org/r/5024b764107463de9578d5b3b0a3d5678e307b1a.170274624... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/adc/ad7091r-base.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/iio/adc/ad7091r-base.c +++ b/drivers/iio/adc/ad7091r-base.c @@ -174,8 +174,8 @@ static const struct iio_info ad7091r_inf
static irqreturn_t ad7091r_event_handler(int irq, void *private) { - struct ad7091r_state *st = (struct ad7091r_state *) private; - struct iio_dev *iio_dev = dev_get_drvdata(st->dev); + struct iio_dev *iio_dev = private; + struct ad7091r_state *st = iio_priv(iio_dev); unsigned int i, read_val; int ret; s64 timestamp = iio_get_time_ns(iio_dev); @@ -234,7 +234,7 @@ int ad7091r_probe(struct device *dev, co if (irq) { ret = devm_request_threaded_irq(dev, irq, NULL, ad7091r_event_handler, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, st); + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, iio_dev); if (ret) return ret; }