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SubjectRe: [PATCH 4/5] uio: Support 2^MINOR_BITS minors
On Fri, Sep 17, 2010 at 10:36:50PM +0200, Thomas Gleixner wrote:
> On Tue, 14 Sep 2010, Eric W. Biederman wrote:
>
> >
> > register_chrdev limits uio devices to 256 minor numbers which causes
> > problems on one system I have with 384+ uio devices. So instead set
> > UIO_MAX_DEVICES to the maximum number of minors and use
> > alloc_chrdev_region to reserve the uio minors.
> >
> > The final result is that the code works the same but the uio driver now
> > supports any minor the idr allocator comes up with.
> >
> > Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
>
> One minor nit:
>
> > + result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name);
> > + if (result)
> > + goto out;
>
> return result;

Wait, why? It's the exact came code, as out does:

out:
return result;

and you need that line due to the code above it. So I say leave it.

thanks,

greg k-h


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