staging: comedi: return error on "read" if no command set up

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The "read" file operation handler, `comedi_read()` returns an error for
pretty much any condition that prevents a "read" going ahead.  One of
the conditions that prevents a "read" going ahead is that no
asynchronous command has been set up, but that currently results in a
return value of 0 (unless COMEDI instructions are being processed or an
asynchronous command has been set up by a different file object).
Change it to return `-EINVAL` in this case.

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

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Ian Abbott 2015-10-12 17:21:27 +01:00 • committed by Greg Kroah-Hartman

parent f84e27adfc

commit a8ed75c083

1 changed files with 6 additions and 1 deletions

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drivers/staging/comedi/comedi_fops.c

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