| Message ID | 20221004134909.1692021-7-nuno.sa@analog.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Make 'mlock' really private | expand |
On Tue, 4 Oct 2022 15:48:59 +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. > > While at it, properly include "mutex.h" for mutex related APIs. > > Signed-off-by: Nuno Sá <nuno.sa@analog.com> > Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Applied to the togreg branch of iio.git and pushed out (shortly) as testing for 0-day etc to take a look. Note I'll be rebasing on rc1 once it's out. Thanks, Jonathan > --- > drivers/iio/adc/meson_saradc.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > > diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c > index 1a68b099d323..85b6826cc10c 100644 > --- a/drivers/iio/adc/meson_saradc.c > +++ b/drivers/iio/adc/meson_saradc.c > @@ -12,6 +12,7 @@ > #include <linux/io.h> > #include <linux/iio/iio.h> > #include <linux/module.h> > +#include <linux/mutex.h> > #include <linux/nvmem-consumer.h> > #include <linux/interrupt.h> > #include <linux/of.h> > @@ -276,6 +277,8 @@ struct meson_sar_adc_priv { > struct clk *adc_div_clk; > struct clk_divider clk_div; > struct completion done; > + /* lock to protect against multiple access to the device */ > + struct mutex lock; > int calibbias; > int calibscale; > struct regmap *tsc_regmap; > @@ -486,7 +489,7 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev) > struct meson_sar_adc_priv *priv = iio_priv(indio_dev); > int val, ret; > > - mutex_lock(&indio_dev->mlock); > + mutex_lock(&priv->lock); > > if (priv->param->has_bl30_integration) { > /* prevent BL30 from using the SAR ADC while we are using it */ > @@ -504,7 +507,7 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev) > !(val & MESON_SAR_ADC_DELAY_BL30_BUSY), > 1, 10000); > if (ret) { > - mutex_unlock(&indio_dev->mlock); > + mutex_unlock(&priv->lock); > return ret; > } > } > @@ -521,7 +524,7 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev) > regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, > MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0); > > - mutex_unlock(&indio_dev->mlock); > + mutex_unlock(&priv->lock); > } > > static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev) > @@ -1250,6 +1253,8 @@ static int meson_sar_adc_probe(struct platform_device *pdev) > if (ret) > goto err; > > + mutex_init(&priv->lock); > + > ret = meson_sar_adc_hw_enable(indio_dev); > if (ret) > goto err;
diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c index 1a68b099d323..85b6826cc10c 100644 --- a/drivers/iio/adc/meson_saradc.c +++ b/drivers/iio/adc/meson_saradc.c @@ -12,6 +12,7 @@ #include <linux/io.h> #include <linux/iio/iio.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/nvmem-consumer.h> #include <linux/interrupt.h> #include <linux/of.h> @@ -276,6 +277,8 @@ struct meson_sar_adc_priv { struct clk *adc_div_clk; struct clk_divider clk_div; struct completion done; + /* lock to protect against multiple access to the device */ + struct mutex lock; int calibbias; int calibscale; struct regmap *tsc_regmap; @@ -486,7 +489,7 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev) struct meson_sar_adc_priv *priv = iio_priv(indio_dev); int val, ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&priv->lock); if (priv->param->has_bl30_integration) { /* prevent BL30 from using the SAR ADC while we are using it */ @@ -504,7 +507,7 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev) !(val & MESON_SAR_ADC_DELAY_BL30_BUSY), 1, 10000); if (ret) { - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&priv->lock); return ret; } } @@ -521,7 +524,7 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev) regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&priv->lock); } static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev) @@ -1250,6 +1253,8 @@ static int meson_sar_adc_probe(struct platform_device *pdev) if (ret) goto err; + mutex_init(&priv->lock); + ret = meson_sar_adc_hw_enable(indio_dev); if (ret) goto err;