| Message ID | 20200605173335.13753-6-andrzej.p@collabora.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Support inhibiting input devices | expand |
On Fri, Jun 05, 2020 at 07:33:33PM +0200, Andrzej Pietrasiewicz wrote: > A new helper is available, so use it. Inspecting 'users' member of > input_dev requires taking device's mutex. > > Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> > --- > drivers/iio/adc/exynos_adc.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c > index 22131a677445..294715bafe25 100644 > --- a/drivers/iio/adc/exynos_adc.c > +++ b/drivers/iio/adc/exynos_adc.c > @@ -630,10 +630,13 @@ static irqreturn_t exynos_ts_isr(int irq, void *dev_id) > struct exynos_adc *info = dev_id; > struct iio_dev *dev = dev_get_drvdata(info->dev); > u32 x, y; > - bool pressed; > + bool pressed, cont; > int ret; > > - while (info->input->users) { > + mutex_lock(&info->input->mutex); > + cont = input_device_enabled(info->input); > + mutex_unlock(&info->input->mutex); > + while (cont) { > ret = exynos_read_s3c64xx_ts(dev, &x, &y); > if (ret == -ETIMEDOUT) > break; > @@ -651,6 +654,10 @@ static irqreturn_t exynos_ts_isr(int irq, void *dev_id) > input_sync(info->input); > > usleep_range(1000, 1100); > + > + mutex_lock(&info->input->mutex); > + cont = input_device_enabled(info->input); > + mutex_unlock(&info->input->mutex); > } The mutex doesn't really protect anything here, but I would nevertheless suggest this sequence instead: lock() while (test) { unlock() ... lock() } unlock() Best Regards, Michał Mirosław
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c index 22131a677445..294715bafe25 100644 --- a/drivers/iio/adc/exynos_adc.c +++ b/drivers/iio/adc/exynos_adc.c @@ -630,10 +630,13 @@ static irqreturn_t exynos_ts_isr(int irq, void *dev_id) struct exynos_adc *info = dev_id; struct iio_dev *dev = dev_get_drvdata(info->dev); u32 x, y; - bool pressed; + bool pressed, cont; int ret; - while (info->input->users) { + mutex_lock(&info->input->mutex); + cont = input_device_enabled(info->input); + mutex_unlock(&info->input->mutex); + while (cont) { ret = exynos_read_s3c64xx_ts(dev, &x, &y); if (ret == -ETIMEDOUT) break; @@ -651,6 +654,10 @@ static irqreturn_t exynos_ts_isr(int irq, void *dev_id) input_sync(info->input); usleep_range(1000, 1100); + + mutex_lock(&info->input->mutex); + cont = input_device_enabled(info->input); + mutex_unlock(&info->input->mutex); } writel(0, ADC_V1_CLRINTPNDNUP(info->regs));
A new helper is available, so use it. Inspecting 'users' member of input_dev requires taking device's mutex. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> --- drivers/iio/adc/exynos_adc.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)