Re: [PATCH 00/23] gpio: sysfs: fixes and clean ups

[Alexandre Courbot]

On Wed, Apr 22, 2015 at 12:42 AM, Johan Hovold <johan@xxxxxxxxxx> wrote:
> These patches fix a number of issues with the gpio sysfs interface,
> including
>
>  - fix memory leaks and crashes on device hotplug
>  - straighten out the convoluted locking
>  - reduce sysfs-interface latencies through more fine-grained locking
>  - more clearly separate the sysfs-interface implementation from gpiolib
>    core
>
> The first patch is marked for stable and could go into 4.1.
>
> Unfortunately we can't just kill the gpio sysfs interface, but these
> patches will make it more manageable and should allow us to implement a
> new user-space interface while maintaining the old one (for a while at
> least) without losing our sanity.
>
> Note that there is still a race between chip remove and gpiod_request (and
> therefore sysfs export), which needs to be fixed separately (for instance as
> part of a generic solution to chip hotplugging).

Thanks a lot for this great series. To my embarrassment I could not
find anything big to say about it. It simply fixes some of the biggest
issues with the sysfs interface and makes things much more
maintainable.

I made a few minor comments, but globally I like this very much.

Reviewed-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
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