* [PATCH v2 2/7] iio: adc: ad7791: claim direct mode when writing frequency
@ 2016-06-01 4:35 Alison Schofield
2016-06-01 19:10 ` Lars-Peter Clausen
0 siblings, 1 reply; 3+ messages in thread
From: Alison Schofield @ 2016-06-01 4:35 UTC (permalink / raw)
To: jic23; +Cc: lars, Michael.Hennerich, knaack.h, pmeerw, linux-iio, linux-kernel
Driver was checking for direct mode and trying to lock it, but
left a gap where mode could change before the desired operation.
Use iio_device_claim_direct_mode() to guarantee device stays in
direct mode.
Refactor function to clarify look-up followed by lock sequence.
Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Cc: Daniel Baluta <daniel.baluta@gmail.com>
---
Changes in v2
Refactored function per reviewers comments
Updated changelog
drivers/iio/adc/ad7791.c | 36 ++++++++++++++----------------------
1 file changed, 14 insertions(+), 22 deletions(-)
diff --git a/drivers/iio/adc/ad7791.c b/drivers/iio/adc/ad7791.c
index cf172d58..1dfe641 100644
--- a/drivers/iio/adc/ad7791.c
+++ b/drivers/iio/adc/ad7791.c
@@ -272,30 +272,22 @@ static ssize_t ad7791_write_frequency(struct device *dev,
struct ad7791_state *st = iio_priv(indio_dev);
int i, ret;
- mutex_lock(&indio_dev->mlock);
- if (iio_buffer_enabled(indio_dev)) {
- mutex_unlock(&indio_dev->mlock);
- return -EBUSY;
- }
- mutex_unlock(&indio_dev->mlock);
-
- ret = -EINVAL;
-
- for (i = 0; i < ARRAY_SIZE(ad7791_sample_freq_avail); i++) {
- if (sysfs_streq(ad7791_sample_freq_avail[i], buf)) {
-
- mutex_lock(&indio_dev->mlock);
- st->filter &= ~AD7791_FILTER_RATE_MASK;
- st->filter |= i;
- ad_sd_write_reg(&st->sd, AD7791_REG_FILTER,
- sizeof(st->filter), st->filter);
- mutex_unlock(&indio_dev->mlock);
- ret = 0;
+ for (i = 0; i < ARRAY_SIZE(ad7791_sample_freq_avail); i++)
+ if (sysfs_streq(ad7791_sample_freq_avail[i], buf))
break;
- }
- }
+ if (i == ARRAY_SIZE(ad7791_sample_freq_avail))
+ return -EINVAL;
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+ st->filter &= ~AD7791_FILTER_RATE_MASK;
+ st->filter |= i;
+ ad_sd_write_reg(&st->sd, AD7791_REG_FILTER, sizeof(st->filter),
+ st->filter);
+ iio_device_release_direct_mode(indio_dev);
- return ret ? ret : len;
+ return len;
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
--
2.1.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2 2/7] iio: adc: ad7791: claim direct mode when writing frequency
2016-06-01 4:35 [PATCH v2 2/7] iio: adc: ad7791: claim direct mode when writing frequency Alison Schofield
@ 2016-06-01 19:10 ` Lars-Peter Clausen
2016-06-03 12:13 ` Jonathan Cameron
0 siblings, 1 reply; 3+ messages in thread
From: Lars-Peter Clausen @ 2016-06-01 19:10 UTC (permalink / raw)
To: Alison Schofield, jic23
Cc: Michael.Hennerich, knaack.h, pmeerw, linux-iio, linux-kernel
On 06/01/2016 06:35 AM, Alison Schofield wrote:
> Driver was checking for direct mode and trying to lock it, but
> left a gap where mode could change before the desired operation.
> Use iio_device_claim_direct_mode() to guarantee device stays in
> direct mode.
>
> Refactor function to clarify look-up followed by lock sequence.
>
> Signed-off-by: Alison Schofield <amsfield22@gmail.com>
> Cc: Daniel Baluta <daniel.baluta@gmail.com>
Looks good, thanks.
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2 2/7] iio: adc: ad7791: claim direct mode when writing frequency
2016-06-01 19:10 ` Lars-Peter Clausen
@ 2016-06-03 12:13 ` Jonathan Cameron
0 siblings, 0 replies; 3+ messages in thread
From: Jonathan Cameron @ 2016-06-03 12:13 UTC (permalink / raw)
To: Lars-Peter Clausen, Alison Schofield
Cc: Michael.Hennerich, knaack.h, pmeerw, linux-iio, linux-kernel
On 01/06/16 20:10, Lars-Peter Clausen wrote:
> On 06/01/2016 06:35 AM, Alison Schofield wrote:
>> Driver was checking for direct mode and trying to lock it, but
>> left a gap where mode could change before the desired operation.
>> Use iio_device_claim_direct_mode() to guarantee device stays in
>> direct mode.
>>
>> Refactor function to clarify look-up followed by lock sequence.
>>
>> Signed-off-by: Alison Schofield <amsfield22@gmail.com>
>> Cc: Daniel Baluta <daniel.baluta@gmail.com>
>
> Looks good, thanks.
>
> Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Applied - thanks.
>
> --
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-06-01 4:35 [PATCH v2 2/7] iio: adc: ad7791: claim direct mode when writing frequency Alison Schofield
2016-06-01 19:10 ` Lars-Peter Clausen
2016-06-03 12:13 ` Jonathan Cameron
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