diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2014-01-21 21:06:34 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-07 23:08:46 +0400 |
| commit | f1ffdfcc52744ed264041741020364cfbad9c0de (patch) | |
| tree | b0b9bf3f660558059aad898f56ea5a1193617110 /drivers/staging | |
| parent | 630127f36784e59e995c206c37825a36a34d346c (diff) | |
| download | linux-f1ffdfcc52744ed264041741020364cfbad9c0de.tar.xz | |
staging: comedi: fix too early cleanup in comedi_auto_config()
`comedi_auto_config()` is usually called from the probe routine of a
low-level comedi driver to allocate and auto-configure a comedi device.
Part of this involves calling the low-level driver's `auto_attach()`
handler, and if that is successful, `comedi_device_postconfig()` tries
to complete the configuration of the comedi device. If either of those
fail, `comedi_device_detach()` is called to clean up, and
`comedi_release_hardware_device()` is called to remove the dynamically
allocated comedi device.
Unfortunately, `comedi_device_detach()` clears the `hw_dev` member of
the `struct comedi_device` (indirectly via `comedi_clear_hw_dev()`), and
that stops `comedi_release_hardware_device()` finding the comedi device
associated with the hardware device, so the comedi device won't be
removed properly.
Since `comedi_release_hardware_device()` also calls
`comedi_device_detach()` (assuming it finds the comedi device associated
with the hardware device), the fix is to remove the direct call to
`comedi_device_detach()` from `comedi_auto_config()` and let the call to
`comedi_release_hardware_device()` take care of it.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/comedi/drivers.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c index 246080316c90..5b15033a94bf 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -616,8 +616,6 @@ int comedi_auto_config(struct device *hardware_device, ret = driver->auto_attach(dev, context); if (ret >= 0) ret = comedi_device_postconfig(dev); - if (ret < 0) - comedi_device_detach(dev); mutex_unlock(&dev->mutex); if (ret < 0) { |