[PATCH 3/5] iio: adc: npcm_adc: Replace indio_dev->mlock with own device lock

Mircea Caprioru
2020-09-28T13:14:28Z

From: Sergiu Cuciurean <sergiu.cuciurean@analog.com>

As part of the general cleanup of indio_dev->mlock, this change replaces
it with a local lock on the device's state structure.

This is part of a bigger cleanup.
Link: https://lore.kernel.org/linux-iio/CA+U=Dsoo6YABe5ODLp+eFNPGFDjk5ZeQEceGkqjxXcVEhLWubw@mail.gmail.com/

Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
---
drivers/iio/adc/npcm_adc.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/npcm_adc.c b/drivers/iio/adc/npcm_adc.c
index d9d105920001..f7bc0bb7f112 100644
--- a/drivers/iio/adc/npcm_adc.c
+++ b/drivers/iio/adc/npcm_adc.c
@@ -25,6 +25,15 @@ struct npcm_adc {
wait_queue_head_t wq;
struct regulator *vref;
struct reset_control *reset;
+ /*
+ * Lock to protect the device state during a potential concurrent
+ * read access from userspace. Reading a raw value requires a sequence
+ * of register writes, then a wait for a event and finally a register
+ * read, during which userspace could issue another read request.
+ * This lock protects a read access from ocurring before another one
+ * has finished.
+ */
+ struct mutex lock;
};

/* ADC registers */
@@ -135,9 +144,9 @@ static int npcm_adc_read_raw(struct iio_dev *indio_dev,

switch (mask) {
case IIO_CHAN_INFO_RAW:
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&info->lock);
ret = npcm_adc_read(info, val, chan->channel);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&info->lock);
if (ret) {
dev_err(info->dev, "NPCM ADC read failed\n");
return ret;
@@ -187,6 +196,8 @@ static int npcm_adc_probe(struct platform_device *pdev)
return -ENOMEM;
info = iio_priv(indio_dev);

+ mutex_init(&info->lock);
+
info->dev = &pdev->dev;

info->regs = devm_platform_ioremap_resource(pdev, 0);
--
2.25.1