Commit cb5a07f1 authored by Alexandru Ardelean's avatar Alexandru Ardelean Committed by Jonathan Cameron
Browse files

iio: imu: adis: protect initial startup routine with state lock 



The initial startup routine is called by some ADIS drivers during probe,
and before registering with IIO. Normally, userspace should not be able to
do any access to the device (as there shouldn't be any available).

This change extends the state lock to the entire initial-startup routine.
Behaviourally nothing should change, but this should make the library
function a bit more robust.

Signed-off-by: default avatarAlexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 762ab093

drivers/iio/imu/adis.c

+10 −6
Original line number Diff line number Diff line
@@ -331,7 +331,7 @@ static int adis_self_test(struct adis *adis) 
{

	int ret;



	ret = adis_write_reg_16(adis, adis->data->msc_ctrl_reg,

	ret = __adis_write_reg_16(adis, adis->data->msc_ctrl_reg,

			adis->data->self_test_mask);

	if (ret) {

		dev_err(&adis->spi->dev, "Failed to initiate self test: %d\n",
@@ -341,10 +341,10 @@ static int adis_self_test(struct adis *adis) 


	msleep(adis->data->startup_delay);



	ret = adis_check_status(adis);

	ret = __adis_check_status(adis);



	if (adis->data->self_test_no_autoclear)

		adis_write_reg_16(adis, adis->data->msc_ctrl_reg, 0x00);

		__adis_write_reg_16(adis, adis->data->msc_ctrl_reg, 0x00);



	return ret;

}
@@ -362,19 +362,23 @@ int adis_initial_startup(struct adis *adis) 
{

	int ret;



	mutex_lock(&adis->state_lock);



	ret = adis_self_test(adis);

	if (ret) {

		dev_err(&adis->spi->dev, "Self-test failed, trying reset.\n");

		adis_reset(adis);

		__adis_reset(adis);

		msleep(adis->data->startup_delay);

		ret = adis_self_test(adis);

		if (ret) {

			dev_err(&adis->spi->dev, "Second self-test failed, giving up.\n");

			return ret;

			goto out_unlock;

		}

	}



	return 0;

out_unlock:

	mutex_unlock(&adis->state_lock);

	return ret;

}

EXPORT_SYMBOL_GPL(adis_initial_startup);

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