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| author | Crestez Dan Leonard <leonard.crestez@intel.com> | 2016-05-03 15:27:09 +0300 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2016-08-19 23:08:41 -0400 |
| commit | 3bdfc8b57f57425b6fc6d1bca4accfbb72d755f8 (patch) | |
| tree | e1ca39389b57d9e59920dcecac7c7994e3e26010 /drivers/iio | |
| parent | f3c7b15dc141f5b3c9deddf8164fae28a9b4de5f (diff) | |
| download | linux-rt-3bdfc8b57f57425b6fc6d1bca4accfbb72d755f8.tar.gz | |
iio: Fix error handling in iio_trigger_attach_poll_func
[ Upstream commit 99543823357966ac938d9a310947e731b67338e6 ]
When attaching a pollfunc iio_trigger_attach_poll_func will allocate a
virtual irq and call the driver's set_trigger_state function. Fix error
handling to undo previous steps if any fails.
In particular this fixes handling errors from a driver's
set_trigger_state function. When using triggered buffers a failure to
enable the trigger used to make the buffer unusable.
Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/industrialio-trigger.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c index d31098e0c43f..ae824d40195a 100644 --- a/drivers/iio/industrialio-trigger.c +++ b/drivers/iio/industrialio-trigger.c @@ -203,22 +203,35 @@ static int iio_trigger_attach_poll_func(struct iio_trigger *trig, /* Prevent the module from being removed whilst attached to a trigger */ __module_get(pf->indio_dev->info->driver_module); + + /* Get irq number */ pf->irq = iio_trigger_get_irq(trig); + if (pf->irq < 0) + goto out_put_module; + + /* Request irq */ ret = request_threaded_irq(pf->irq, pf->h, pf->thread, pf->type, pf->name, pf); - if (ret < 0) { - module_put(pf->indio_dev->info->driver_module); - return ret; - } + if (ret < 0) + goto out_put_irq; + /* Enable trigger in driver */ if (trig->ops && trig->ops->set_trigger_state && notinuse) { ret = trig->ops->set_trigger_state(trig, true); if (ret < 0) - module_put(pf->indio_dev->info->driver_module); + goto out_free_irq; } return ret; + +out_free_irq: + free_irq(pf->irq, pf); +out_put_irq: + iio_trigger_put_irq(trig, pf->irq); +out_put_module: + module_put(pf->indio_dev->info->driver_module); + return ret; } static int iio_trigger_detach_poll_func(struct iio_trigger *trig, |