| Message ID | 20220920112821.975359-5-nuno.sa@analog.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Make 'mlock' really private | expand |
On Tue, 20 Sep 2022 13:28:10 +0200 Nuno Sá <nuno.sa@analog.com> wrote: > The iio_device lock is only meant for internal use. Hence define a > device local lock to protect against concurrent accesses. Mention the mutex.h include. Technically it's an unrelated (good) change. Definitely not worth a separate patch however so just mention it in the description. > > Signed-off-by: Nuno Sá <nuno.sa@analog.com> > --- > drivers/iio/adc/imx7d_adc.c | 13 ++++++++----- > 1 file changed, 8 insertions(+), 5 deletions(-) > > diff --git a/drivers/iio/adc/imx7d_adc.c b/drivers/iio/adc/imx7d_adc.c > index 86caff1d006b..fa19f5e09079 100644 > --- a/drivers/iio/adc/imx7d_adc.c > +++ b/drivers/iio/adc/imx7d_adc.c > @@ -13,6 +13,7 @@ > #include <linux/kernel.h> > #include <linux/mod_devicetable.h> > #include <linux/module.h> > +#include <linux/mutex.h> > #include <linux/platform_device.h> > #include <linux/regulator/consumer.h> > > @@ -108,7 +109,8 @@ struct imx7d_adc { > struct device *dev; > void __iomem *regs; > struct clk *clk; > - > + /* lock to protect against multiple access to the device */ > + struct mutex lock; > u32 vref_uv; > u32 value; > u32 channel; > @@ -293,7 +295,7 @@ static int imx7d_adc_read_raw(struct iio_dev *indio_dev, > > switch (mask) { > case IIO_CHAN_INFO_RAW: > - mutex_lock(&indio_dev->mlock); > + mutex_lock(&info->lock); > reinit_completion(&info->completion); > > channel = chan->channel & 0x03; > @@ -303,16 +305,16 @@ static int imx7d_adc_read_raw(struct iio_dev *indio_dev, > ret = wait_for_completion_interruptible_timeout > (&info->completion, IMX7D_ADC_TIMEOUT); > if (ret == 0) { > - mutex_unlock(&indio_dev->mlock); > + mutex_unlock(&info->lock); > return -ETIMEDOUT; > } > if (ret < 0) { > - mutex_unlock(&indio_dev->mlock); > + mutex_unlock(&info->lock); > return ret; > } > > *val = info->value; > - mutex_unlock(&indio_dev->mlock); > + mutex_unlock(&info->lock); > return IIO_VAL_INT; > > case IIO_CHAN_INFO_SCALE: > @@ -487,6 +489,7 @@ static int imx7d_adc_probe(struct platform_device *pdev) > > info = iio_priv(indio_dev); > info->dev = dev; > + mutex_init(&info->lock); > > info->regs = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(info->regs))
diff --git a/drivers/iio/adc/imx7d_adc.c b/drivers/iio/adc/imx7d_adc.c index 86caff1d006b..fa19f5e09079 100644 --- a/drivers/iio/adc/imx7d_adc.c +++ b/drivers/iio/adc/imx7d_adc.c @@ -13,6 +13,7 @@ #include <linux/kernel.h> #include <linux/mod_devicetable.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> @@ -108,7 +109,8 @@ struct imx7d_adc { struct device *dev; void __iomem *regs; struct clk *clk; - + /* lock to protect against multiple access to the device */ + struct mutex lock; u32 vref_uv; u32 value; u32 channel; @@ -293,7 +295,7 @@ static int imx7d_adc_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: - mutex_lock(&indio_dev->mlock); + mutex_lock(&info->lock); reinit_completion(&info->completion); channel = chan->channel & 0x03; @@ -303,16 +305,16 @@ static int imx7d_adc_read_raw(struct iio_dev *indio_dev, ret = wait_for_completion_interruptible_timeout (&info->completion, IMX7D_ADC_TIMEOUT); if (ret == 0) { - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&info->lock); return -ETIMEDOUT; } if (ret < 0) { - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&info->lock); return ret; } *val = info->value; - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&info->lock); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: @@ -487,6 +489,7 @@ static int imx7d_adc_probe(struct platform_device *pdev) info = iio_priv(indio_dev); info->dev = dev; + mutex_init(&info->lock); info->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(info->regs))
The iio_device lock is only meant for internal use. Hence define a device local lock to protect against concurrent accesses. Signed-off-by: Nuno Sá <nuno.sa@analog.com> --- drivers/iio/adc/imx7d_adc.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)