staging: comedi: restrict comedi_set_hw_dev() usage

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Don't allow comedi drivers to change `dev->hw_dev` using
`comedi_set_hw_dev()` if it's already been set.  Return `-EEXIST` in
that case.

`dev->hw_dev` needs to be set to NULL by the core during clean-up of the
comedi device, so add a local function `comedi_clear_hw_dev()` to do
that.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ian Abbott 2013-02-01 13:23:20 +00:00 • committed by Greg Kroah-Hartman

parent da71751177

commit de06d7c6b8

1 changed files with 11 additions and 4 deletions

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drivers/staging/comedi/drivers.c

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