staging: comedi: comedi_fops: introduce __comedi_get_user_chanlist()

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The COMEDI_CMD and COMEDI_CMDTEST ioctl functions both copy the chanlist
passed by the user from __user memory space to kernel memory space. They
then do some sanity checking of the chanlist with comedi_check_chanlist()
before the subdevice (*do_cmdtest) and (*do_cmd) operations are called.

Introduce a helper function to handle the memdup_user() and the sanity
checking.

Also, remove the unnecessary dev_dbg() when the memdup_user() or
comedi_check_chanlist() fail.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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H Hartley Sweeten 2014-03-06 12:02:57 -07:00 • committed by Greg Kroah-Hartman

parent 87ece58331

commit c6cd0eefb2

1 changed files with 36 additions and 40 deletions

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drivers/staging/comedi/comedi_fops.c

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