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SubjectRe: GPIO: Fix probe() error return in gpio driver probes
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On Monday 15 December 2008, Jean Delvare wrote:
>
> > > > I was thinking that -EINVAL is almost the least informative
> > > > diagnostic code possible, since so many places return it
> > > > that it's usually hard to find out *which* invalid parameter
> > > > triggered ...
> > > >
> > > > Is there a less-overloaded code you could return?
> > >
> > > -EINVAL sounds right to me, all that's really missing is dev_dbg()
> > > messages in the drivers to log what the exact problem was.

Fair enough, though it just papers over how ambiguous -EINVAL is.


> > It might be more acceptable to be dev_err(), that way it will get
> > printed no matter what debug options have been selected. If so, a
> > seperate patch is probably in order to make the change.
>
> As far as I can see, such errors would be caused by development-time
> mistakes, so dev_dbg() seems appropriate. dev_err() would make the
> binaries larger for all end-users.

Right, dev_dbg() is the way to go. I'd ack a version of this patch
which pairs these -EINVAL changes with dev_dbg() messages to make
these problems less painful to track down. dev_err() is much abused.

- Dave



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