On 19/07/14 11:33, Himangi Saraogi wrote:
This patch moves data allocated using unmanaged interfaces to managed
interfaces like devm_kzalloc, devm_iio_device_register, devm_kasprintf,
devm_request_threaded_irq and does away with the calls to free the
allocated memory in the probe and remove functions. Some labels in the
probe function are also removed.
Signed-off-by: Himangi Saraogi <himangi774@xxxxxxxxx>
cc'ing Lars who tends to look after Analog Devices drivers
and more specifically was involved in the thread that lead to this
patch.
Also, the devm_kasprintf does not appear to be in upstream so this
patch should have made an dependency clear.
https://lkml.org/lkml/2014/7/16/667
What is the intended merge path for that patch?
---
I am not very sure if devmifying request_irq is a good idea as it
leads to the freeing of the interrupt after the ad7280_write.
Agreed. I wouldn't do it!
Otherwise, all looks fine.
drivers/staging/iio/adc/ad7280a.c | 57 ++++++++++++++-------------------------
1 file changed, 20 insertions(+), 37 deletions(-)
diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index d215edf..3706b3e 100644
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -486,8 +486,8 @@ static int ad7280_channel_init(struct ad7280_state *st)
{
int dev, ch, cnt;
- st->channels = kcalloc((st->slave_num + 1) * 12 + 2,
- sizeof(*st->channels), GFP_KERNEL);
+ st->channels = devm_kcalloc(&st->spi->dev, (st->slave_num + 1) * 12 + 2,
+ sizeof(*st->channels), GFP_KERNEL);
if (st->channels == NULL)
return -ENOMEM;
@@ -547,8 +547,9 @@ static int ad7280_attr_init(struct ad7280_state *st)
{
int dev, ch, cnt;
- st->iio_attr = kzalloc(sizeof(*st->iio_attr) * (st->slave_num + 1) *
- AD7280A_CELLS_PER_DEV * 2, GFP_KERNEL);
+ st->iio_attr = devm_kzalloc(&st->spi->dev, sizeof(*st->iio_attr) *
+ (st->slave_num + 1) *
+ AD7280A_CELLS_PER_DEV * 2, GFP_KERNEL);
if (st->iio_attr == NULL)
return -ENOMEM;
@@ -564,7 +565,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
st->iio_attr[cnt].dev_attr.store =
ad7280_store_balance_sw;
st->iio_attr[cnt].dev_attr.attr.name =
- kasprintf(GFP_KERNEL,
+ devm_kasprintf(&st->spi->dev, GFP_KERNEL,
"in%d-in%d_balance_switch_en",
(dev * AD7280A_CELLS_PER_DEV) + ch,
(dev * AD7280A_CELLS_PER_DEV) + ch + 1);
@@ -581,7 +582,8 @@ static int ad7280_attr_init(struct ad7280_state *st)
st->iio_attr[cnt].dev_attr.store =
ad7280_store_balance_timer;
st->iio_attr[cnt].dev_attr.attr.name =
- kasprintf(GFP_KERNEL, "in%d-in%d_balance_timer",
+ devm_kasprintf(&st->spi->dev, GFP_KERNEL,
+ "in%d-in%d_balance_timer",
(dev * AD7280A_CELLS_PER_DEV) + ch,
(dev * AD7280A_CELLS_PER_DEV) + ch + 1);
ad7280_attributes[cnt] =
@@ -900,48 +902,36 @@ static int ad7280_probe(struct spi_device *spi)
ret = ad7280_attr_init(st);
if (ret < 0)
- goto error_free_channels;
+ return ret;
- ret = iio_device_register(indio_dev);
+ ret = devm_iio_device_register(&spi->dev, indio_dev);
if (ret)
- goto error_free_attr;
+ return ret;
if (spi->irq > 0) {
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER,
AD7280A_ALERT, 1,
AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN);
if (ret)
- goto error_unregister;
+ return ret;
ret = ad7280_write(st, AD7280A_DEVADDR(st->slave_num),
AD7280A_ALERT, 0,
AD7280A_ALERT_GEN_STATIC_HIGH |
(pdata->chain_last_alert_ignore & 0xF));
if (ret)
- goto error_unregister;
-
- ret = request_threaded_irq(spi->irq,
- NULL,
- ad7280_event_handler,
- IRQF_TRIGGER_FALLING |
- IRQF_ONESHOT,
- indio_dev->name,
- indio_dev);
+ return ret;
+
+ ret = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
+ ad7280_event_handler,
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT, indio_dev->name,
+ indio_dev);
if (ret)
- goto error_unregister;
+ return ret;
}
return 0;
-error_unregister:
- iio_device_unregister(indio_dev);
-
-error_free_attr:
- kfree(st->iio_attr);
-
-error_free_channels:
- kfree(st->channels);
-
- return ret;
}
static int ad7280_remove(struct spi_device *spi)
@@ -949,16 +939,9 @@ static int ad7280_remove(struct spi_device *spi)
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad7280_state *st = iio_priv(indio_dev);
- if (spi->irq > 0)
- free_irq(spi->irq, indio_dev);
- iio_device_unregister(indio_dev);
-
ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_HB, 1,
AD7280A_CTRL_HB_PWRDN_SW | st->ctrl_hb);
- kfree(st->channels);
- kfree(st->iio_attr);
-
return 0;
}
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